1.How long dose a jacket like this last me? _______________________ (這要看你多長(zhǎng)時(shí)間穿一次).
    2. The theory he advanced has proved _________________ (對(duì)許多傳統(tǒng)概念的一種挑戰(zhàn)).
    3. The manager ___________________ (本可以親自參加會(huì)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(duì)健康是必不可少的).
    5.They requested_________________(我借的書(shū)還回圖書(shū)館) by next Friday.
    答案與解析:
    1.It depends on how often you wear it。本題考察一個(gè)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(duì)過(guò)去的假設(shè)could have done表示本來(lái)可以但是沒(méi)有; “參加會(huì)議”的說(shuō)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(duì)……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(shū)還回圖書(shū)館。request 有“要求”的意思時(shí)，引導(dǎo)的賓語(yǔ)從句要用虛擬語(yǔ)氣，結(jié)構(gòu)為：request that sb. (should) do sth.