1.How long dose a jacket like this last me? _______________________ (這要看你多長時間穿一次).

　　2. The theory he advanced has proved _________________ (對許多傳統(tǒng)概念的一種挑戰(zhàn)).

　　3. The manager ___________________ (本可以親自參加會議),but he was called away for some urgent business abroad.

　　4. Both research and practical experience have shown that a __________________ (均衡的飲食對健康是必不可少的).

　　5.They requested_________________(我借的書還回圖書館) by next Friday.

　　答案與解析:

　　1.It depends on how often you wear it。本題考察一個固定搭配：要看(取決于)：depend on：多久一次用how often表示。

　　2.(to be )a challenge to many traditional notions / concepts.證明是…：be proved to be;挑戰(zhàn)：challenge

　　3.could have attended the meeting in person/by himself。對過去的假設could have done表示本來可以但是沒有; “參加會議”最好的說法是attend the meeting/ conference;親自：in person/ by oneself。

　　4.a balanced diet is essential to health.均衡飲食:balanced diet;對……必不可少：be essential to

　　5.that I(shuold) return the books borrowed to library /the books I borrowed (should) be returned to the library.他們要求我在下周五之前把借的書還回圖書館。request 有“要求”的意思時，引導的賓語從句要用虛擬語氣，結構為：request that sb. (should) do sth.

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