The new product is beyond all praise and has quickly taken over the market ___ its superior quality.
A. in terms of B. by virtue of
C. on behalf of D. on top of
Not until recently _______the development of tourist-related activities in the rural areas.
A. they had encouraged B. had they encouraged
C. did they encourage D. they encouraged
In those days, our ________ concern was to provide people who were stopped by the snowstorm with food and health care.
A. permanent B. precise
C. privileged D. primary
Never shall I forget that poem and the inspiration _________provided for my first novel.
A. which B. that
C. it D. what
It is so good a habit to instruct children to lay things _______ they belong when they are young.
A. to which B. that
C. in which D. where
假设你是李明，暑假参加了为期两周的美国夏令营活动。在这两周里，你住在Smith夫妇家中，他们为你提供了吃、住、行及旅游方面的帮助。请写一封电子邮件感谢他们。内容须包括以下要点：
1．已安全回到中国。
2．感谢Smith夫妇的帮助。
注意：
1．词数：100个左右；
2．开头和结尾均已写好，不计入总词数。
Dear Mr and Mrs Smith，
How time flies！___________________________________________________________________________
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I will cherish the merry memories for the rest of my life. I hope we can keep in touch.
Yours，
Li Ming
