______ polar bear population is ______ sensitive topic for the Canadian government, which allows limited hunting.
| A．A; the | B．A; a | C．The; the | D．The; a |
In April, 2009, President Hu inspected the warships in Qingdao, the 60th anniversary of the founding of the PLA Navy.
| A．marking | B．marked | C．having marked | D．being marked |
for the bad weather, I would have gone for a spring outing with my classmates yesterday.
| A．If it is not | B．Were it not | C．Had it not been | D．If it wasn’t |
The storm left, a lot of damage to this area.
| A．caused | B．to have caused | C．to cause | D．having caused |
, and the problem will be solved.
| A．Make a bit more effort | B．There being a little effort |
| C．If you make a bit more effort | D．Making a little effort |
There no buses, we had to walk home after work.
| A．was | B．were | C．being | D．had |