Don’t make a noise! They _______on a physics problem now.

Don’t play a trick _____ him.[ ]

Since nuclear(核) pollution broke out in Japan, in March,2011,we are all _____ of it very much.

It took me about 40 minutes to ride here.——Have a drink ,please. You ________ be thirsty.

Hi, Amy. Why are you so sad?—Well, I found the computer I had had _________ went wrong again.