________ have an internal clock that controls the beating of our heart, and the ________ of our breathing.
| A．Human being; steps | B．Humans; pace |
| C．Human beings; steps | D．Man; pace |
I found the cat _____ under the bed, who had caught a mouse.
| A．hiding | B．hidden | C．to hide | D．having hidden |
Those _____ to go to the exhibition should inform the office.
| A．not wanting | B．who not want | C．not wanted | D．are not want |
There were many more people who got injured in the big fire than _______.
| A．was reported | B．it was reported | C．were reported | D．they were reported |
_____ of water makes Death Valley a desert, but it is by no means devoid.
| A．Lacking | B．Being lack | C．Because of lack | D．Lack |
There are some police cars in front. What do you suppose _____?
| A．is the matter | B．is happened | C．is the wrong | D．the trouble is |