各位英语高手，请教几个问题。

Question

My sister is sleeping. COuld you ______ the radio?
A. turn on B. turn off C. turn over D. turn down
Do you have to buy this hat? No, I ______. It's not necessary.
A. mustn't B. won't C. needn't D. don't need
The strap needs mending. It ______.
A. has mended B. has to be mended C. has been mended D. has been mending
The children are standing _______ the starting line and are ready ______ run.
A. at; to B. at; for C. in; to D. in; for
Sam was taking his savings to the post office _____ he lost his wallet.
A. when B. as C. while D. just as

Answer 1

1.B
2.C
3.B needs mending 是需要被修理 B是必须被修理A. 是主动语态，不对，而且时态不对C 时态不对，这句是修过了D时态、语态都不对
4.C
5.A时间状语从句的连词只能用when或while，when任何情况都可以，while前后必须都是过去进行时，这里应选When本回答被提问者采纳

Answer 2

1 B 关掉
2 C 不必
3 C
4 A be ready to do sth
5 A 翻译：萨姆正带存款去邮局时，这时他把钱包丢了。解释：1. 此题考查when的一个特殊用法：when可以做并列连词，引导并列句，而不是做从属连词引导时间状语从句。此时when = and then，翻译为“就在这时”。此种用法要求前句2.必须为过去进行时或含有was/were about to do sth结构。2. while引导时间状语从句时，要求从句的谓语动词必须是延续性动词，而lost his wallet为一个终止性动词，排除。while引导并列句时，翻译为“与此同时/然而”，表示转折对比关系，不妥。3. as和Just as同样引导时间状语从句，一般翻译成“一边...，一边...”/“正当...的时候”，要求前后两个动作同时进行，也不是并列句用法，排除。

Answer 3

1.d turndown将声音调小 2.c 不需要 3.b 被动语态 4.b 固定搭配 5.b 状语从句，as表原因

Answer 4

良莠不齐。
下面的这个是对的
热心网友 最快回答
BCBAA满意请采纳O(∩_∩)O谢谢

Answer 5

BCBAA

满意请采纳O(∩_∩)O谢谢