16.The advertisements are trying ________ people to buy things they don‘t really need.
    A. persuade 　B. persuading 　C. be persuading 　D. to persuade
    17.Practice ________ English every day.
    A. speak 　B. to speak 　C. speaks 　D. speaking
    18.The discount houses were first established in that period of time ________ people‘s purchasing power was low.
    A. which 　B. that 　C. when 　D. where
    19.Please write a report ________ the above subjects are to be covered.
    A. which 　B. in which 　C. that 　D. in thatwww.examw.com
    20.The reason ________ I‘m writing is to ask for your permission to translate your latest novel into 　Chinese.
    A. because 　B. why 　C. for 　D. as
    參考答案：
    16.正確答案：D答案解析：try to do：試圖做某事。
    17.正確答案：D答案解析：本題考查的是practice后面要跟動詞的ing形式。
    18.正確答案：C答案解析：先行詞是in that period of time，所以關(guān)系詞應(yīng)選擇when.
    19.正確答案：B答案解析：in which the above subjects are to be covered是report的定語從句。which指代先行詞report，in用于與report搭配。
    20.正確答案：B答案解析：本題考查的是定語從句的用法。先行詞是the reason;引導(dǎo)詞why表示原因。