The water supply has been cut off temporarily because the workers ________ one of the main pipes.
| A．had repaired | B．have repaired |
| C．repaired | D．are repairing |
—I am afraid I can't return the book to you before Friday.
— ______ .
| A．Take your time | B．Be careful |
| C．Not at all | D．Don't be afraid |
Bluetooth is a radio-technology allowing cell phones, wireless earphones, etc. to ______ radio signals, so that people can contact each other within 10 metres.
| A．match | B．share |
| C．protect | D．exchange |
—John, I know nothing about playing tennis. I wonder if you could teach me.
— ______ . Just name the day.
| A．I'm glad | B．Go ahead |
| C．If you want it | D．With pleasure |
Enjoying popular songs on the Internet has greatly ______ me the trouble of going to the video shops to purchase some VCDs.
| A．shared | B．spared |
| C．cost | D．canceled |
We will ______ all the natural resources if we continue consuming them like that.
| A．run out | B．wipe out |
| C．drop out | D．hold out |