We were swimming in the lake _____ suddenly the storm started.
| A．when | B．while | C．until | D．before |
The prices have been rising all the time, especially that of housing. So it is high time the government _______ action to solve it.
| A．takes | B．have taken | C．took | D．to take |
— So much work needs to be finished in such a short time.
— _________ I’ll give you a hand.
| A．Not to worry. | B．So what? |
| C．You can’t be too careful! | D．That’s right. |
. _________ the wind and the sun, the color on the board gradually ran.
| A．Being exposed to | B．Having exposed | C．Exposing | D．Exposed to |
________ no modern technology, the Egyptians had to move each stone by hand.
| A．It being | B．There being | C．There was | D．Being |
No sooner ________ at the airport than she was surrounded by the reporters.
| A．had the star arrived | B．the star had arrived |
| C．has the star arrived | D．the star has arrived |