Some researches have proved that water quality ____ due to too many dams and pumps in some areas.
| A．has been declined | B．is being declined |
| C．is declining | D．had been declining |
I was out of town at the time, so I don’t know exactly how it _______. 
| A．was happening | B．happened | C．happens | D．has happened |
— What’s that terrible noise?
— The boys _________ for a party.
| A．are preparing | B．have prepared | C．prepare | D．will prepare |
In Turkey, sometimes babies _______ for the time of their birth．
| A．are named | B．name |
| C．have been named | D．named |
—Have you started writing your report?
—Not yet．I _______ a hard time getting the information.
| A．am having | B．had |
| C．was having | D．will have |
—Have you received a reply to your job application?
—No．I ______．
| A．waited | B．am waiting |
| C．have waited | D．had been waiting |
Since the new speed limits ______，the number of accidents in the area has fallen strikingly．
| A．were introduced |
| B．introduced |
| C．have been introduced |
| D．have introduced |
I ________ in Nanjing for many years, but I’ve never regretted my final decision to move back to Huai’an.
| A．worked | B．was working | C．have worked | D．had worked |
According to Charles Keeling, the amount of carbon dioxide ________ sharply and steadily over the forty years between 1957 and 1997.
| A．increased | B．had increased |
| C．had been increased | D．was increasing |
The film was really wonderful! I _____ such a good film for ages before that night!
| A．haven’t seen | B．didn’t see |
| C．hadn’t seen | D．wasn’t seeing |
The captain as well as his team interviewed shortly after they won the gold medal．
| A．are | B．was | C．is | D．were |
Hi, Jack. Nice to see you here. I _____ you would come to the party.
| A．don’t know | B．didn’t know |
| C．haven’t known | D．hadn’t known |
— Have you moved to your new house?
— Not yet. My house ______.
| A．has been painted | B．is painted |
| C．is painting | D．is being painted |
He was unhappy when he sold his guitar.After all, he ________ it for a very long time.
| A．has had | B．had had |
| C．has | D．had |
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