— I dreamed of some animals running on the moon.
— It ____ be. There is no air or water on the moon, you know.
A. can’t B. may not C. shouldn’t D. mustn’t
An American plane is reported ____ in the Atlantic Ocean with 228 people aboard, the airline’s worst disaster in its 75-year history.
A. to have crashed B. to have been crashed
C. having crashed D. having been crashed
Time should be made good use of ____ our lessons well.
A. to learn B. learning C. learn D. learnt
— ____ you read the newspaper?
— Yes. I ____ it on the bus while I was on my way to work.
A. Have; read B. Did; read C. Have; have read D. Did; have read
We ____ on this project for four hours. Let’s have a rest.
A. are working B. have been working C. worked D. had worked
Internet shopping is really ____ when people are sure of its safety.
A. taking off B. taking up C. setting up D. setting off
