1.The research requires more money than__1__.
    A. have been put in B.has been put in C.being put in D. to be put in
    2.Overpopulation poses a terrible threat to the human race. Yet it is probably__2__a threat to the human race than environmental destruction.
    A.no more B. not more C. even more D. much more
    3.It is not uncommon for there__3__problems of communication between the old and the young.
    A.being B.would be C.be D. to be
    4.__4__at in his way, the situation doesn’t seem so desperate.
    A. Looking B.Looked C.Being looked D. To look
    5.It is absolutely essential that William__5__his study in spite of learning difficulties.
    A.will continue B.continued C.continue D. continues
    答案:
    1.B　
    [解析]:看新編語法教程,里面說這里than后面是省略了it,還原應(yīng)該是..than it has been put in
    2.B
    [解析]:上句說人口多對(duì)人類發(fā)展造成威脅.而大家要注意這個(gè)yet,yet常用于否定句和疑問句,
    也就是說下句應(yīng)該是一個(gè)"否定"上句的句子.,而not more ...than的意思就是 與其說是A ,不如說是B.
    這句話.Yet it is probably not more a threat to the human race than environmental destruction.就是與其說是威脅了人類發(fā)展,還不如說是威脅了環(huán)境...
    3.D
    [解析]: 語法課講了多少遍,for there to be,of there being..
    4.C
    [解析]:讓我們做簡(jiǎn)單的還原,這里的the situation 是邏輯主語,如果the situation looked at in his way.群眾的looked是過去時(shí),主動(dòng)時(shí)態(tài),而 the situation 是"被"看待的.怎么會(huì)是主動(dòng)的呢?
    5.C
    [解析]: 這里是省略了should是用法