Today ________ number of people learning English in China ________ increasing rapidly. 

—Are you sure Mike will help us if we are in trouble? — _____. He is a reliable friend.

I thought Jim would say something about his school report, but he ______ it. 

Since Shanghai won the right to host the World Expo, over half a million people have volunteered to ___________in all the Shanghai Expo projects .

Is this the reason__________at the meeting for his carelessness in his work?