Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
A.since | B.after | C.before | D.when |
It was in 1969 ______ two Americans went to the moon by spaceship.
A.that | B.before | C.when | D.Since |
—What ________ an important part in their lives?
—Friends.
A.plays | B.takes | C.makes | D.Acts |
He wouldn’t leave the TV set, ______ he was going to have an important exam the next day.
A.even so | B.even if | C.as though | D.as if |
As soon as she saw her boyfriend, she ________ crying.
A.burst into | B.broke out | C.burst out | D.broke in |
—May I ask a question after class,Sir?
—, but not during my lunch break.
A.I am sorry | B.Anytime | C.Go ahead | D.Certainly |