Those black clouds are a sure _____ that it’s going to rain.
| A．thing | B．mark |
| C．sign | D．one |
—Did you find the missing couple in the mountain yesterday?
—No, but we ______ to get in touch with them ever since.
| A．had tried | B．have tried | C．have been trying | D．had been trying |
After working for two years, Tim Martin was ______ as the top manager in charge of the company.
| A．ranked | B．classified | C．appointed | D．recognized |
I’m ______ a diet, since I put ______ weight easily.
| A．in; on | B．on; in | C．in; in | D．on; on |
The fire spread through the hotel very quickly, but everyone _____ get out.
| A．had to | B．would | C．was able to | D．could |
She must be looking forward to as much to his return as he himself is to _______ her.
| A．see | B．have seen | C．seeing | D．be seeing |