The boss________company I worked in two years ago has________in solving such kind of problem.

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

I don’t know where to go this summer vacation.——Why not_____visiting Huanggang?There are many places of interest there.

If I _____ you, I _____ late for school this morning.

Nick, ____ you ____ my book?–Sorry, I came here just now .