He tried his best to solve the problem, _______difficult it was.
| A．however | B．no matter | C．whatever | D．although |
___________ we should do to protect wildlife?
| A．Do you think what | B．Do you think how |
| C．What do you think | D．How do you think |
— Do I have to clean the dining room now?
— No, you ______.
| A．don’t have to | B．mustn’t | C．needn’t to | D．shouldn’t |
About 110 million people moved to this city. The population is ______ as ten years ago.
| A．as twice large | B．twice as large | C．as many twice | D．twice as many |
If you are ________ about Australian cities, just read the book written by Dr Johnson.
| A．interested | B．anxious | C．upset | D．Curious |
I know that smoking is a bad habit, but I can’t ______ the feeling that I need to smoke.
| A．have fun with | B．get rid of | C．look forward to | D．get away with |