The story happened (发生) the evening of November 1st,1998. [ ]

Shall we go out for a swim?—Sorry, I can’t. I ______ housework for my mother now.

_ may have a chance to be successful if he tries his best.

What do you think of your teachers?—Not all the teachers are very strict ________ their students.[ ]

When you don’t know a word, you can _________ in the dictionary.