31.The company had about 20 notebook computers but only one third _______used regularly . Now we have 60 working all day long.
| A．is | B．are | C．was | D．were |
—What about the student in your class, Mr. Wang?
—The doctor said that ________ sleep caused him poor memory and poor concentration.
| A．lacking of | B．lacked in | C．lacking | D．lack for |
____________ many times, but he still couldn’t understand it.
| A．Though he had been told | B．Having been told |
| C．Having told | D．He had been told |
It was in the lab_________was taken charge of by Johnson_________they did the experiment.
| A．where; which | B．which; that | C．which; which | D．that; which |
_______ cleaning the yard and making up the beds for the old, we also read newspapers for them and had chats with them.
| A．Except for | B．Rather than | C．Apart from | D．Instead of |
-----I stayed up late last night preparing the speech.
-----__________ you look so tired today.
| A．No doubt | B．No problem | C．No time | D．No wonder |