There are various ________（技術(shù)）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.

假如你是一名導(dǎo)游，陪同某國(guó)際旅行社游覽長(zhǎng)城。車抵長(zhǎng)城，下車前你準(zhǔn)備對(duì)大家作必要的介紹和交代。請(qǐng)擬一份講話稿。講話稿必須包括以下幾點(diǎn)：

1． 簡(jiǎn)單介紹長(zhǎng)城（是世界上最長(zhǎng)的城墻，有2000多年的歷史，是世界奇觀之一）；

2． 講話的時(shí)間是8點(diǎn)半，在長(zhǎng)城逗留兩個(gè)半小時(shí)，11點(diǎn)鐘離開：

3． 游覽車（bus） 在入口處等候，記住車號(hào)，準(zhǔn)時(shí)返回：

4． 貴重（valuable）物品隨身攜帶，下車前關(guān)上車窗；

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