Thank you for sending us fresh vegetables of so many kinds. You have done us great service.
| A．/; a | B．the; a |
| C．/; / | D．the; / |
Mr. Lee, who as a guide for over 10 years, is now a manager in a big travel agency.
| A．worked | B．has worked | C．had worked | D．works |
In the school hall, where a meeting , some students are busy preparing for it.
| A．is held | B．has been held | C．is being held | D．is to be held |
the coming English speech competition will be a lot of work, so I need some volunteers to help out.
| A．Organize | B．Organizing | C．Organized | D．Being organized |
Rock-climbing is a breathtaking activity, very popular nationwide among young people,
cooperation as well as courage plays an important role.
| A．who | B．which | C．that | D．where |
Your advice was a great help to us, without which all our efforts .
| A．wouldn’t pay off | B．hadn’t paid off |
| C．wouldn’t have paid off | D．didn’t pay off |