Mr. Li, I can’t understand everything in class.—Don’t worry! I’ll ________ the main points at the end.

I told myself to stay ____________ .

The research on the new flu virus vaccine ischallenging and demanding Who do you think can do the job —_______ my students have a try

— Millie, _________ late for school again. — Sorry, I won’t.

―Ben and sue aren’t home,are they―No.They to London on business.