【练习】用whichever，no matter which填空。

1). _________ of you comes in first will get the book.

2). _________ side wins, I shall be satisfied.

3). You can take _________ you like.

4). ________ you choose, you must stand by your decision.

Keys: 1). Whichever 2). Whichever (=No matter which)

3). whichever 4). Whichever (=No matter which) 2. cloth / clothe / clothes / clothing 【解释】

cloth n. 指"衣料"时是不可数名词，作"（特殊用途的）布"时，是可数名词，如：a table cloth；a dish-cloth

clothe vt. 给"给......穿衣，为......提供衣物"，如：He has to work hard to feed and clothe his large family.

clothes n. 指"衣服\服装"；包括"上衣\裤子\内衣"等，是复数名词，没有单数，不能直接和连词连用,后面要接复数动词，如：These new clothes are all for her.

clothing n. 指"总称衣服\被褥"，还包括"帽子\鞋袜"等，没有复数形式，后面跟单数动词，如：Our clothing protects us from cold. / A coat is a clothing. 【练习】用cloth，clothe，clothes，clothing填空。

1). We have enough food and ________ for the winter.

2). She' s got many beautiful ________.

3). Now they are able to feed and ________ their children better.

4). He was following _______ behind.

5). She began cleaning the wound with a piece of _______.

6). Wipe the surface of the table with a damp _______.

Keys: 1). clothing 2). clothes 3). clothe 4). closely 5). cloth 6). cloth 3. preserve / reserve 【解释】

preserve意为"保护；维护；保养；防止（食物）腐败"，强调使不受破坏。

reserve意为"保留，储备，订（座位），预定"，强调为某一特殊目的。 【练习】用preserve，reserve填空。

1). At minus 130ºC, a living cell can be _________ for a thousand years.

2). We are _________ these seats for our parents.

3). You' d better _________ your strength for the basketball game.

4). The government ________ the rights of the individual person.

Keys: 1). preserved 2). reserving 3). reserve 4). preserves III 词性变化 （旨在提供语法填空所需材料）

1. central adj.中央的，核心

的；(位于)中心的；主要的 center n.圆心，正中；中心v. 把......集中于 centrally adv. 中央地，集中地 2. attract vt.吸引，引起......的注意 attraction n.吸引(力)；具有吸引力的人或物 attractive adj.有吸引力的，引起注意的 3. tourism n. 旅游事业 tour v. 旅行，游历 tourist n.旅游者，观光者 4. length n.长，长度，距离；一段，一节 lengthen v. (使)变长，延伸 long adj./adv. 长(期)的(地) n.长时间 vi.渴望 5. settler n.移居者；殖民者 settle vt. 调停；安排；支付 vi.定居；飞落 settlement n.解决，协议；居留地