When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________.
| A．protect the thing on fire |
| B．add weigh to the thing on fire |
| C．keep the air away from the thing on fire |
| D．lower the temperature of the thing on fire |
We need to __________a plan about what to do on Clean-up Day.
| A．come up with | B．come over | C．come along | D．come out |
They were _________ when they heard the _______ news.
| A．excited, exciting | B．exciting, excited |
| C．excited, excited | D．exciting, exciting |
Beijing is one of the ____ in the world today.
| A．busiest city | B．busiest cities | C．busy city | D．busy cities |
In our class some students are too shy to __________ our hands when the teachers ask us to answer questions.
| A．put on | B．put down | C．put out | D．put up |
If it _____________ tomorrow, we’ll have a picnic.
| A．not rain | B．won’t rain | C．doesn’t rain | D．didn’t rain |