Now complete the blanks with must,should, shouldn't, or couldn't:
1.Im so thankful for your help with this project. I ____ have done it without you!
2.The repairs I made ____ have fixed the problem, but they didn't so I'll have to take another look.
3.It ____ have rained a lot last night there are puddles everywhere.
4.I ____ have watched that horror movie; it gave me nightmares.
5.We ____ have known about this; nobody told us anything about it.
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Answer:
1.couldn't
2.should
3.must
4.shouldn't
5.must