_____ about the man wearing sunglasses during night that he was determined to follow him．
| A．So curious the detective was | B．So curious was the detective |
| C．How curious was the detective | D．How curious the detective was |
Dr. Smith, together with his wife and daughters, _____ visit Beijing this summer.
| A．is going to | B．are going to |
| C．was going to | D．were going to |
The number of foreign students attending Chinese universities _____ rising steadily since 1990.
| A．is | B．are | C．has been | D．have been |
— Why does the lake smell terrible?
— Because large quantities of water ____.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
Although we have only met ______, I find we have a lot in common.
| A．from time to time | B．in time |
| C．by chance | D．over and over again |
Only ______ allowed to take part in the speech contest in our class and so the rest ______ disappointed.
| A．was John; were | B．John was; were |
| C．was John; was | D．John was; was |