The popular belief has been challenged after a recent research ________ cartilage(软骨) in human joints can’t repair itself.
A.where B.whether C.when D.that
In order to keep extra cash in your monthly budget, you may ________ 30% on your first home, instead of 40%.
A.put down B.bring down C.take down D.get down
Jenny feels a blankness ________ she once felt a sense of purpose and excitement.
A.unless B.where C.as D.since
LED lighting, even in most developed countries, ________ long enough to know its effects across the human lifespan.
A.has not been used B.was not used
C.had not been used D.is not being used
In this giant city, they had no one else ________ support they knew they could count on.
A.of whom B.of which C.whose D.that
假设你是校学生会主席李华。美国某中学学生访问团将到你校访问一天。请你写邮件给对方领队 Smith先生，告知在校一天的活动安排。要点如下：
1. 表示欢迎；2. 介绍活动安排；3. 表达祝愿。
注意：1. 词数120左右；2. 可以适当増加细节，以使行文连贯。
Dear Smith,
___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours
Li Hua
