In the cross-lake swimming race, a boat will be ____in case of an emergency.
| A．standing by | B．turning on | C．getting on | D．running on |
Don’t have the lights ______ all day long. It is a waste of electricity.
| A．burn | B．burned | C．burning | D．to burn |
Either you or the headmaster ______ the prizes to the gifted students.
| A．is handing out | B．are to hand out | C．are handing out | D．is to hand out |
The 2010 Shanghai World Expo is well worth ______.
| A．visit | B．visited | C．to visit | D．visiting |
I am interested in traveling. It is ______ but ______.
| A．interesting; tiring | B．interested; tired |
| C．interesting; tired | D．interested; tiring |
The windows haven’t cleaned for a long time. They need ______.
| A．to clean | B．to be cleaned | C．cleaning | D．B and C |