I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.
| A．hadn’t done | B．didn’t do |
| C．haven’t done | D．don’t do |
The opening between walls was very narrow; it’s very hard for soldiers to _______ through.
| A．squeeze | B．press | C．stretch | D．leap |
A yellow taxi _______ alongside a truck at the traffic lights when an elderly woman was crossing the road.
| A．brought up | B．took up | C．pulled up | D．put up |
—Our train to Shenzhen didn’t leave until 14:30 because of something wrong with the railway.
—Such a long delay! This train at 13:00.
| A．left | B．will leave | C．leaves | D．has left |
By the side of the Bird’s Nest , completed in 2008.
| A．there standing the Water Cube | B．stands the Water Cube |
| C．does the Water Cube stand | D．the Water Cube stands |
you are so eager to join the school basketball team, why not try out for it?
| A．While | B．Now that | C．Though | D．Unless |