The iphone 4s, ________ by Apple, sells well across the world.
A. produce B. produced
C. producing D. to produce
Science fiction writers often write about _______will happen in “tomorrow’s world”.
A. why B. that C. what D. how
Medicine and food ________ to the flood areas soon.
A. send B. was sent
C. will send D. will be sent
When _______ comes to advertisements, we must all use our intelligence.
A. that B. it C. there D. this
________ he found the idea interesting, it was too difficult to be of practical use.
A. While B. Once C. If D. Until
As they were walking around, they noticed a man _______ against a tree.
A. sit B. to sit C. sitting D. sat
