Because the aircraft will finally end up in the water, it ______ be unsinkable and built entirely of environmentally friendly materials.
| A．can | B．may |
| C．must | D．Will |
—Is this raincoat yours?
—No, mine _____ there behind the door.
| A．hangs | B．is hanging | C．has hung | D．is hanged |
Lily _____ a book about China last month but I don’t know whether she has finished it.
| A．wrote | B．had written | C．is writing | D．was writing |
I first met Lisa three years ago. She _____ at a radio shop at that time.
| A．has worked | B．was working | C．had been working | D．had worked |
I don’t work here; I _____ until a new secretary arrives.
| A．am just helping out | B．just help out |
| C．have just helped out | D．will just help out |
—I’m sorry to keep you waiting.
—Oh, not at all. I _____ here only a few minutes.
| A．am | B．was | C．have been | D．will be |