1) We _________ respect old people. a) should b) shouldn't 2) We__________ keep our environment clean. a) should b) shouldn't 3) We_____________ spit on the floor. a) shouldn't b) should 4) We__________ give pregnant women or old people a seat in public transportation.  a) shouldn't b) should 5) We _________ interrupt while someone is speaking. a) should b) shouldn't 6) We _______ use phrases like 'please, thank you, you are welcome' when we communicate with others. a) should b) shouldn't 7) We ____________ mock people. a) should b) shouldn't 8) We ____________ use other people's belongings without permission. a) shouldn't b) should 9) We __________ speak aloud in public. a) should b) shouldn't 10) We __________ deal with our smartphones while we are talking to someone.  a) shouldn't b) should

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