Shopping on line is very popular .We find easy to shop on line .

About _______of the engineers in my company seem to be in their _________．

I feel so nervous before the exam that I can’t sleep well at night. — I think having a holiday will_______ help you relax.

Beijing is the capital of China and it is one of ______ cities in the world.

Frank, you look worried. Anything wrong? — Well, I______ a test and I’m waiting for the result．