There are eight tips in Dr.Roger's lecture on sleep，and one of them is：________ to bed early unless you think it is necessary.
| A．doesn't go | B．not to go |
| C．not going | D．don't go |
Our bodies are strengthened by taking exercises. ____, our minds are developed by learning.
| A．Probably | B．Likely | C．Similarly | D．Generally |
The computer, ______________ help we human beings have stepped into the information age, should be made full use of to promote the social development.
| A．which | B．whose | C．with its | D．with whose |
Customers are asked to make sure that they ____ the right change before leaving the shop.
| A．will give | B．have been given | C．have given | D．will be given |
Because the two countries were at _____ war, the people had ______ hard life.
| A．/; the | B．the; the | C．/; a | D．a; a |
—-______
—Certainly, it is my great pleasure.
| A．Can you give me a hand? | B．How are you getting on with your work? |
| C．What can I do for you? | D．What a nice day! |