His friends ignored his advice, ______ they knew it to be helpful.
| A．as if | B．since | C．even if | D．so that |
Many people in China have never dreamed of ______ a chance for them to learn to drive after their retirement.
| A．being | B．there | C．there to be | D．there being |
Tom pretended ______ it；but in fact，he knew it very well.
| A．not to listen to |
| B．not to hear about |
| C．not to have heard about |
| D．not to be listening to |
The country has acknowledged ______ every means to fight against any possible attack.
| A．to have taken | B．have taken | C．to having taken | D．having taken |
—What about saving the drowning boy from the other side of the river?
—In my opinion，______.
| A．it makes sense | B．it's out of the question |
| C．it's up to you | D．it's hard to say |
______ two giraffes，Zheng He later brought zebras，shells，elephant ivory back to China after his voyages.
| A．Besides that | B．Except | C．In addition | D．Apart from |