We all know laws to discourage the use of plastic bags _______ in many parts of the world.
| A．passed | B．have passed | C．had been passed | D．have been passed |
.Sally______ a book about China last year but I don't know whether she has finished it.
| A．wrote | B．has written | C．was writing | D．had written |
---Has Tom finished his composition yet?
---I have no idea, he _____ it this morning.
| A．would write | B．has written | C．wrote | D．was writing |
.---Why were you not at the concert last night ?
---Oh.I ______ for a friend from Europe at the airport.
| A．watched | B．have been watching |
| C．was watching | D．had watched |
Many new workers _____ trained and in two months they will _____ to build a new railway.
| A．are; be sending | B．are being; be sent |
| C．are; send | D．will be; be to send |
.I thought I was going to fail the exam, but I succeeded _______.
| A．first all | B．in all | C．at all | D．after all |