Which sentence uses the simple past correctly?, She test graphene., She tested graphene., She tests graphene., She testing graphene., Choose the simple past form of "build"., building, builds, builded, built, They _____ a new composite last year., developed, develops, develop, developing, Which question is in the simple past?, Are they mixing it?, Do they mix it?, Did they mix it?, Have they mixed it?, The scientist _____ the sample carefully., examining, examine, examined, examines, Choose the correct negative sentence., He did not use steel., He not used steel., He did not used steel., He does not used steel., Which word is the simple past of "find"?, finded, found, finds, finding, We _____ stronger fibers in the lab., create, creates, creating, created, Which sentence is NOT in the simple past?, He melted plastic., She measured density., We analyze samples., They discovered foam., Choose the correct simple past sentence., The team chose copper., The team choosing copper., The team choose copper., The team chooses copper., Yesterday, the engineer _____ a heat-resistant layer., adds, adding, add, added, Which is the simple past form of "take"?, takes, took, taked, taking, Did the researchers recycle the material?, Yes, they have., Yes, they were., Yes, they did., Yes, they do., Select the sentence with a correct irregular verb., The mold broke suddenly., The mold breaked suddenly., The mold broken suddenly., The mold breaks suddenly., Last month, we _____ a radical material for insulation., designing, designed, design, designs.

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