Some of the members demanded to know why they had been keptthe true facts until they reached the present critical stage

Are you willing to live on Mars one day –____________．It sounds exciting，but it still worries me.

Go along the street and turn left. You can find it __________. You can’t miss it.—OK, thank you very much.

What _______ to her yesterday evening

Why did Wei Fen find _____difficult to learn English