With more forests being destroyed, huge quantities of good earth ____ each year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
—Hurry up！Alice and Sue are waiting for you at the school gate.
—Oh！I thought they ________ without me.
| A．went | B．are going |
| C．have gone | D．had gone |
We arrived at work in the morning and found that somebody ________ into the office during the night.(2011·江西)
| A．broke | B．had broken |
| C．has broken | D．was breaking |
By the time Jack returned home from England，his son ________ from college.(2011·辽宁)
| A．graduated | B．has graduated |
| C．had been graduating | D．had graduated |
In the last few years thousands of films ________ all over the world.
| A．have produced | B．have been produced |
| C．are producing | D．are being produced |
— Alvin，are you coming with us?
—I'd love to，but something unexpected ________.
| A．has come up | B．was coming up |
| C．had come up | D．would come up |