–Sorry, Professor Smith. I didn’t finish the assignment yesterday. --Oh, you _____ have done it as yesterday was the deadline. A. must B, mustn’t C, should D. shouldn’t
These wild flowers are so special that I would do ____I can to save them.
The computer system____ suddenly while he was searching for information on the Internet.
–When can I come for the photos? I need them tomorrow afternoon. -They ___be ready by 12:00
In our childhood, we were often ___by Grandma to pay attention to our table manners A.demanded b reminded C. allowed D. hoped
20.______ that caused him to serve dinner an hour later than usual.