Ladies and gentleman, please fasten your seat belts! The plane ________.
A. takes off B. is taking off C. has taken off D. took off
Only when ________ be possible to sign the papers.
A. does the boss come will it B. the boss comes will it
C. has the boss come it will D. the boss comes it will
—Excuse me! How can I get to the nearest post office?
—Walk along this road for a few minutes, and you’ll it there．
A. make B. get C. take D. miss
Lily is popular among her classmates ______ she can be annoying at times.
A. in case B. even if C. as if D. so that
We all consider ______ important that we should put theory into practice.
A. that B. which C. this D. it
Just like fingerprints, each person’s DNA is ________unless he has a twin.
A. unusual B. normal C. various D. unique
