50. The lazy boy got up very late and went to school in a hurry. When he arrived at school, he found that he had put his socks on _______.
______ left before the deadline, it doesn’t seem likely that John will finish the job.
Medical ______ shows that men are more likely to have heart attacks than women.
Several years had passed ______ I finally realized the true value of friendship.
It’s a mistake to think of Chongqing only ______ its tourist attractions.
All passengers ______, please fasten your seat belts and remain seated ______ the plane is landing.