I was held up for about half an hour in the traffic jam，__________ the delay.
| A．it caused |
| B．thus causing |
| C．caused |
| D．to cause |
—Are you worried about the coming exam?
—Only ______.
| A．gradually | B．broadly | C．slightly | D．extremely |
Word came ______ our school will build a new teaching building next year.
| A．that | B．which | C．whether | D．when |
A poet and artist _____ coming to speak to us about Chinese literature and painting tomorrow afternoon.
| A．is | B．are | C．was | D．were |
We must try our best to the river being polluted any more.
| A．separate | B．keep | C．prevent | D．guard |
_____ he can pass the driving test is quite uncertain.
| A．If | B．Whether | C．That | D．What |