To plant a tree，we must dig_________ .
| A．a three feet deep hole |
| B．three-foot deep a hole |
| C．a hole three feet deep |
| D．a three-feet-deep hole |
When taking an examination, we are usually not allowed to __________ dictionaries for the words we don't understand.
| A．look up | B．look for |
| C．pick out | D．refer to |
Every possible means __________ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used |
| C．has been used | D．have been used |
You know Australia is a big country, but you may not know how easy it is to __________.
| A．get around | B．get along |
| C．get over | D．get in |
Chinese TV host Xie Na and singer Zhang Jie held their wedding __________ on Monday in Shangri-La.
| A．celebration | B．ceremony |
| C．performance | D．congratulation |
Standing at the top of the hill, we saw the train gradually __________ and disappeared in the distance.
| A．swept up | B．picked up |
| C．put up | D．speeded up |