Scientists from different countries are trying to_______ a good way to solve the energy problem.
| A.keep up with | B.come up with | C.catch up with | D.meet up with |
We are from China and we _______ Chinese.
| A.say | B.talk | C.speak | D.tell |
Some students are so ______ that they often make mistakes in their homework.
| A.carful | B.serious | C.careless | D.successful |
__ we are young, we can still do something to help protect the environment.
| A.If | B.Since | C.Because | D.Though |
--- Jimmy, don’t put this pair of trousers on the sofa.
--- Sorry, mum. I will _____________ right now.
| A.take it away | B.take them away |
| C.knock it off | D.knock them off |
---You were out when I went to your house this morning.
---Oh, I _______ for a friend from England at the airport.
| A.was waiting | B.waited |
| C.am waiting | D.have waited |