Joan stood outside a shopping mall for a long time, as if ________ somebody.
| A．to wait for | B．waiting for | C．waited for | D．having waited for |
The flu is believed________by viruses that like to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused |
| C．to be caused | D．to have caused |
He hadn’t paid for his water so the company had________it off.
| A．put | B．keep |
| C．shut | D．take |
In the last few years thousands of films________all over the world.
| A．have produced | B．have been produced |
| C．are producing | D．are being produced |
The manager thought________difficult to finish the task in such a short time.
| A．that | B．it |
| C．this | D．him |
We are so ________ at the news that so many people were ________ and killed in the earthquake.
| A．shocked；injured | B．concerned；lost |
| C．surprised；harmed | D．trapped；hurt |