There are various ________（技术）for dealing with industrial pollution.

Why is Tom silent? Why doesn't he ______ us _____ the conversation?（ ）

A. join in; for　　　 B. join; for　　 C. join; in　　 D. attend; in

It is w___________ to spend the whole day in the forest, o_________ how the chimps live.

--- This book by Tony Garrison is of great use for our course.

--- But I think his latest one is ______ worth reading.

A. better         B. more          C. most          D. very

She looked a ___________ when she heard the surprising news.

假如你是一名导游，陪同某国际旅行社游览长城。车抵长城，下车前你准备对大家作必要的介绍和交代。请拟一份讲话稿。讲话稿必须包括以下几点：

1． 简单介绍长城（是世界上最长的城墙，有2000多年的历史，是世界奇观之一）；

2． 讲话的时间是8点半，在长城逗留两个半小时，11点钟离开：

3． 游览车（bus） 在入口处等候，记住车号，准时返回：

4． 贵重（valuable）物品随身携带，下车前关上车窗；

5． 祝大家玩得愉快。

The food＿＿＿at the moment is for the dinner party.

　　A.cooked B.to be cooked C.is being cooked D.being cooked

We spent many years studying the formation of rocks, experiencing many sufferings．At last, our hard work _______, and we made it．

　 A．paid off　　 B．paid back　 C．gave away　 D．came out

A person                 a foreign language must be able to use the foreign language               all about his own.      

A. to learn, to forget    B. learning, to forge    C. to learn, forgetting    D. learning, forgetting