悬赏分：0 - 离问题结束还有 14 天 23 小时
1.serve的用法。如服务顾客（serve sb.还是serve for sb.)?
2.prepare的用法。
如：
prepare the mid-term examination还是 prepare for the mid-term examination
prapare the examination还是prepare for the examination?
3.average的用法
如：
（ ）4 people were killed in the road accidents every day last year.
是Average还是The average of还是An average of还是Average of?
5.I've a______ only half of what I hoped to do.
(是以"A"为首字母填空）
6.----I thought you didn't like coffee.
----Well,I ______but I_______.
A.usedn't to;do
B.usedn't ;do
再讲一下used的用法。
谢谢啊
