It’s too bad that I failed in the math exam. If only I ______ hard at it!
| A．worked | B．had worked | C．has worked | D．would work |
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! |
Hurry up! The shop ＿＿ in five minutes.
| A．closes | B．is closing | C．has closed | D．is about to close |