3. The thieves stole $ 1 million __________ of jeweler.

4. The plan is __________ to be carefully considered.

5. The __________ gentleman donated 500 million dollars to the poor people.

6. It's __________ taking / to take the trouble to explain a job fully to new employees.

Key:1. worth 2. worth 3. worth 4. worthy 5. worthy 6. worthwhile

【简析】 worth 作动词时意思是"值......"，后面需要接名词或动名词。接名词时，名词往往是表示钱数或相当于钱数的名词，如price, money等，也可以接相当于"代价"的比喻性名词；在接动名词时，要用主动形式表示被动意义 (如1、2)；另外，worth还可用作名词，用在表示数量、持续时间等名词的后面（如 3）；worthy"值得"，后接不定式的被动结构或of ＋ 名词(如4)；另外，worthy还可用作定语，表示"可钦的，高尚的"（如5）；worthwhile"值得的"，表示值得花时间或经历做某事，可作表语或定语（如6）。

二、 alive; living; live; lively

1. The driver was still __________ after the serious accident, which made us all surprised.

2. Many people are still buried __________ after the earthquake.

3. Shelley was still __________ when Keats died.

4. The expert is experimenting on a ________ mouse.

5. Did you watch the __________ broadcast of the World Cup last night?

6. She is a __________ child and popular with everyone.

Key:1. alive 2. alive 3. living 4. live

5. live 6. lively

【简析】 alive"活着的"，主要用作表语和补语，作定语时要作后置定语，常用来指虽有死的可能，但仍然还活着 (如1、2)；living"活着的，健在的"，用作表语或定语，表示在某某时候是活着的（如3）；live"活的；现场直播的"，表示"活着"时，主要用来修饰动植物（如4、5）；lively"有生气的，精力充沛的；生动的"(如 6)。

三、 feed on; live on; feed ... on ...; feed ... to ...

1. Sheep mainly __________ grass.

2. -How is his life?

-Not very well. He has only his small salary to __________.

3. She __________ for many years after her husband died.

4. What do you __________ your dog ________?

5. He __________ grass __________ the horse.

Key:1. feed on 2. live on 3. lived on 4. feed ... with ... / feed ... on ... 5. feeds; to

【简析】 feed on..."以......为食"，多用于指牛、马、羊等动物 (如1)；live on "以......为生；靠（某种经济来源）过活；继续生存"（如2、3）；feed ... on ..."用......喂......"，有时也可以用feed ... with ... (如 4)；feed ... to ..."给（某人或某物）作为食物"(如5)。

四、 stand for; stand by; stand in; stand out

1. -Do you know what's the meaning of "GNP"?

-Yes. It __________ gross national product.

2. Please remember I'll __________ you whatever happens.

3. How can you __________ and let him treat his dog like that?

4. My assistant will __________ for me while I'm away.

5. They were all attractive, but she __________ from the others.

Key: 1. stands for 2. stand by 3. stand by

4. stand in 5. stood out