The zoo keepers is worried because the number of visitors __ smaller
and smaller.
A. become B. became C. is becoming D. have become
With films like Avatar proving__________ in cinemas, many technology experts believe 3D is now set to take over the home market,
A. difficult B. easy C. common D. popular
Look out! Keep away from the house, _____ the roof is under repair．
A．whose B．which C．of which D．where
YaoMing, as we know, _____ like to play basketball.
A. does B. appears C. feels D. sounds
There are over 58,000 rocky objects in ______ space, about 900 of which could fall down onto ______ earth.
A. the; the B. /; the C. the; a D. a; /
Even though they are not doubtful at all _______ John will pass the exam, I still wonder ______ he is fully prepared.
A. whether; that B. that; whether C. that; that D. whether; whether
