1) we...........complete the task in time because it is very important for us a) must b) can c) could d) mustn't e) can't f) couldn't 2) they........understand the meaning of the sentence because it was too difficult for them a) could b) couldn't c) must d) was able e) can f) hadn't to 3) ı don't think you......... see everything in three days in Istanbul a) should b) haven't c) can d) won't able e) will able f) must 4) john run very fast but he ....... arrive in time a) couldn't b) was able to c) shouldn't d) could e) hasn't to f) wasn't able

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