三校生英语选择题8题,求详解.

三校生英语选择题8题,求详解.
1.He ____ have completed his work,otherwise he wouldn't be enjoying himself by the beach.
A.should B.must C.wouldn't D.can't.B 请问如何解释,为何A不行.
2.____ our food ______,we had to walk to a village for help.
A.Since,runs out.B.Because,run out.C.With,running out D.For,running out.A 可以嘛.since解释为 既然呀.
3.Don't be discouraged._____ things as they are and you will enjoy every day of your life.
A.Take B.To take C.taking D.taken..A .那 C呢.动名词开头嘛.
4._____ more and more forests were destroyed,some animals are facing the danger of dying out.
A.By B.With C.As D.For C.D 不可以吗.因为.
5.All the neighbors admire this family,_____ the parents are treating their kids like a friend.
A.why B.where C.which D.that..完全不理解- -.
6.He will have nothing to ____ if he refuses to listen to his teachers.
A.earn B.catch.C.gain.D.grasp.C.固定搭配嘛?那别的有什么搭配?
7.I promise to ____ the matter as soon as i get back to the head office.
A.look for.B.search for.C.enter into.D.look into.D.
8.Voices were ____ as the discussion between the two groups became more heated.
A.increased.B.repeated.C.raised.C.risen 那D呢.

第一题：must have done表示一定做了某事,而should have done表示本应做某事（实际没做）,句意表示他一定是完成了他的工作,否则他在海边不会玩的那么开心.
第二题：A时态就有错误,后面是had,而A是runs,C表示伴随,可理解为由于、因为
第三题：祈使句,此举表示鼓励,应用祈使句.
第四题：as 是从属连词,说明一般的因果关系,它引导的从句通常放在句首,有时也可放句末.for 是并列连词,用来附带解释说明前一分句的原因或理由,for引导的并列句,一般放在所要说明的句子的后面.
第五题：从句意上理解,所有的邻居都钦佩这个家庭,在这父母对待孩子像朋友一样.可以理解成一个虚的地点.
第六题：nothing to gain一无所获.A表示挣得,B表示追赶,D表示抓住,掌握,C表示获得
第七题：look into调查,A、B表示寻找,C表示进入、加入.句意表示我许诺调查这件事情
第八题：rise 是不及物动词,没有被动语态.raise 是及物动词,在此题中表示提高,抬高.