Green products are becoming more and more popular because they are environmentally________。
A. friendly B. various C. common D. changeable
—How long do you think it will be________ China sends a manned spaceship to the moon?
—Perhaps two or three years.
A. when B. until C. that D. before
Ladies and gentlemen, please fasten your seat belts. The plane________.
A. takes off B. is taking off C. has taken off D. took off
Sorry, Madam. You’d better come tomorrow because it’s ________ the visiting hours.
A. during B. at C. beyond D. before
Look out! Don’t get too close to the house________ roof is under repair.
A .whose B. which C. of which D. that
-Who called me this morning when I was out?
-A man calling ________ Robert.
A. him B. himself C. his D.不填
