Shanghai is about 1，460 km away from Beijing and it's nearly a ride by high-speed train.
A. six hours B. six-hour's
C. six-hour D. six-hours
—Can children under the age of 12 ride bicycles in your city?
—No， according to the law，they .
A. may not B. needn't
C. mustn't D. shouldn't
—Has your sick pet dog been cured yet?
—Not yet. It's still under .
A. discussion B. control
C. treatment D. repair
He made a serious mistake，but he took action to change that it got worse.
A. before B. when C. because D. until
—Dad， there is something wrong my computer. I can't get on the Internet.
—Let me have a look. Oh，it's wrong you to click a wrong icon.
A. with； with B. with； of
C. of； with D. of； of
old man in blue， university professor， is teaching his students unusual
study skill.
A. An； a； the B. An； an； an
C. The； an； an D. The； a； an
