Leave your key with a neighbor _______ you lock yourself out one day.
| A．ever since | B．even if | C．soon after | D．in case |
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______ left before the deadline, it doesn’t seem likely that John will finish the job.
| A．Though such a short time | B．Because such a short time |
| C．With such a short time | D．As such a short time |
.
Medical ______ shows that men are more likely to have heart attacks than women.
| A．expectation | B．evidence | C．experience | D．exchange |
.
Several years had passed ______ I finally realized the true value of friendship.
| A．when | B．that | C．after | D．before |
.
All passengers ______, please fasten your seat belts and remain seated ______ the plane is landing.
| A．on board; before | B．abroad; since | C．on the board; after | D．aboard; when |
.
Unfortunately, it was in Yushu County, ______ a 7.1-magnitude earthquake happened on April 14, 2010, ______ a large number of students were buried inside damaged schools.
| A．which; when | B．that; that | C．where; that | D．where; which |