Chinese vessels ________ 646,000 square kilometers in the southern Indian Ocean in search of the missing Malaysian flight MH370.
| A．have covered | B．have looked |
| C．have travelled | D．have reached |
We left the small town, ______ clearly_____ no need to stay.
| A．there； being | B．it; was |
| C．it; being; | D．there；was |
There are frequently reports of accidents as fireworks ______, stored or transported.
| A．have been made | B．are being made |
| C．were made | D．have made |
Plastic bottles can be recycled but they need cleaning thoroughly, _______ they?
| A．needn't | B． don't | C．mustn't | D．can't |
Of all the methods they provided, ______ is of any help for solving the math problem.
| A．nothing | B．neither | C．none | D．no one |
—Tom seems to be familiar with London.
---Yes. He ___________ here for three years. It’s great for him to be back.
| A．have lived | B．had lived | C．lived | D．lives |