单选题 The pressure ______ causes Americans to be energetic, but it also puts them under a constant emotional strain.

单选题 I had just started back for the house to change my clothes ______ I heard voices.

单选题 It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.

单选题 When he arrived, he found ______ the aged and the sick at home.

单选题 Had he worked harder, he ______ the exams.

单选题 The new appointment of our president ______ from the very beginning of next semester.

单选题 I asked him to ______ me a few minutes so that I could have a word with him.

单选题 The soldier was ______ of running away when the enemy attacked.

单选题 Only under special circumstances ______ to take make-up tests.