If Dr. Plunkett hadn't experimented with a new coolant gas, he _____ Teflon., a. wouldn't discover, b. hadn't discovered, c. wouldn't have discovered, d. won't have discovered, If scientists hadn't made that breakthrough, medical research _____ more slowly., a. would have progressed, b. will have progressed, c. had progressed, d. would progress yesterday, If I had chosen a different major at college, I _____ a different career., a. will have pursued, b. had pursued, c. would pursue yesterday, d. might have pursued, If the researchers hadn't noticed the unusual phenomenon, they _____ the connection., a. wouldn't make yesterday, b. might not have made, c. hadn't made, d. won't have made, A student failed an exam because he went to a party instead of studying. Which sentence correctly expresses criticism of his decision?, a. He shouldn't have gone to the party., b. He shouldn't went to the party., c. He shouldn't have go to the party., d. He shouldn't going to the party., A researcher lost some important data because she didn't save her work. Which sentence correctly describes a missed opportunity?, a. She could saved a backup copy., b. She could have save a backup copy., c. She could saving a backup copy., d. She could have saved a backup copy., Nobody knows whether the missing document was accidentally deleted. Which sentence correctly expresses uncertainty about what happened?, a. Someone might deleted it by mistake., b. Someone might have deleted it by mistake., c. Someone might have delete it by mistake., d. Someone might has deleted it by mistake., A former student is talking about an unforgettable experience at college. Which sentence correctly describes a memory of a completed event?, a. I'll never forget to meet my best friend at college., b. I'll never forget meet my best friend at college., c. I'll never forget meeting my best friend at college., d. I'll never forget met my best friend at college., A freshman needs to submit an assignment tomorrow. Which sentence correctly expresses something the student must remember to do?, a. I must remember submitting my assignment tomorrow., b. I must remember submit my assignment tomorrow., c. I must remember submitted my assignment tomorrow., d. I must remember to submit my assignment tomorrow., A student interrupted a walk across campus to talk to a professor. Which sentence correctly describes that interruption?, a. She stopped talking to her professor., b. She stopped to talk to her professor., c. She stopped talk to her professor., d. She stopped talked to her professor., A grandmother insisted that her grandson try a traditional home remedy. Which sentence correctly describes what she did?, a. She made him try the remedy., b. She made him to try the remedy., c. She made him trying the remedy., d. She made that he tried the remedy., A researcher allowed the students to examine the results of an experiment. Which sentence correctly describes that permission?, a. The researcher let the students to examine the results., b. The researcher let the students examining the results., c. The researcher let the students examine the results., d. The researcher let the students examined the results., A scientific explanation made a difficult topic easier for the students to understand. Which sentence correctly describes that benefit?, a. The explanation helped the students understanding the topic., b. The explanation helped the students understood the topic., c. The explanation helped the students to understood the topic., d. The explanation helped the students understand the to, Complete the sentence to emphasize a childhood memory: "_____ was the smell of fresh grass after the rain.", a. What I remember most, b. What do I remember most, c. That I remember most, d. What I most remembering, Which sentence correctly emphasizes the most memorable feature of a photograph?, a. The thing what I liked most was the colorful background., b. The thing I liked most was the colorful background., c. The thing I liked most it was the colorful background., d. The thing I most liked it the colorful background., Complete the sentence to emphasize a sensory detail: "The thing I remember most about my grandfather _____.", a. it was his deep voice, b. were his deep voice, c. was his deep voice, d. was that his deep voice, Which sentence correctly emphasizes what the speaker misses about a childhood vacation?, a. What I miss most are the smell of the ocean., b. What do I miss most is the smell of the ocean., c. What I miss most it is the smell of the ocean., d. What I miss most is the smell of the ocean., Complete the conversation without repeating "childhood memories": "I have several vivid childhood memories." "I have some wonderful _____, too.", a. so, b. ones, c. it, d. do, Complete the conversation without repeating the verb phrase: "Do you remember spending summers at your grandparents' house?" "Yes, I _____.", a. am, b. have, c. do, d. was, Complete the sentence without repeating "my childhood photographs": "I found my childhood photographs yesterday, and looking at _____ brought back so many memories.", a. them, b. it, c. that, d. one

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