Are you sure _________?
A. how far is Mars away from the sun
B. what is the transport like on Mars
C. of the distance from the sun to Mars
D. the life on Mars will be different from on the Earth
—Mike hardly puts up his hand in class, ________ he?
— ________, he is one of the most active students in our class.
A. does; No B. doesn’t; Yes
C. does; Yes D. doesn’t; No
—What’s your plan for the coming summer holiday?
—I’ll devote as much time as I can ________ some voluntary work.
A. to do B. doing C. do D. to doing
The computer has _______ a virus for long, why not have it __________？
A. had，mended B. caught, mended
C. had, mend D. caught, mend
—What are you doing? —I’m reading the book ______you lent me last week.
A . what B. who C. when D. that
There is ______ eating grass on the hill.
A. a few sheeps B. a sheep C. some sheep D. little sheeps
