–What’s the matter with you?
–After the long walk, my legs ____ and I couldn’t go any further.
| A．gave out | B．gave off | C．gave in | D．gave up |
Some pills many people take to achieve or maintain their desired weight will lower their life expectancy_____ they contain something harmful．
| A．so that | B．in that | C．even if | D．as if |
We shall not start the project until it __________ by the committee.
| A．will be approved | B．approves |
| C．has been approved | D．is to approve |
Bears ______ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
| A．pack up | B．build up |
| C．bring up | D．take up |
With many cities in China dreadfully blanketed by thick haze, the environmental problem is _____ Chinese people concern most nowadays.
| A．what | B．which | C．where | D．when |
According to scientists, our mental abilities begin to _____ from the age of 27 after reaching the highest level at 22.
| A．differ | B．shrink | C．fail | D．decline |