Unit 11 Planting trees
一、用括号内所给的单词的适当形式填空。
1.We have built lots of trees across the part of China. (north)
2.English is widely used for between different countries. (busy)
3.Each of us has only two ______ . (foot)
4.Read the _______ passage and answer the questions. (follow)
5.Mum bought a _______ sweater for me yesterday. (wool)
6.She was _______ sorry about it last time. (true)

答案：1.northern 2.business 3.feet 4.following 5.woolen 6.truly
说明：
第1题：north是名词，意思是“北方”，该句需要修饰名词part的形容词，在词尾加ern构成其形容词。类似的词还有east-eastern; south-southern; west- western。
第2题：for是介词，其后面接名词，在busy后面加ness构成其名词形式。如：ill-illness。
第4题：follow是动词，该句需要修饰名词passage的形容词形式，在follow之后加ing构成其分词作形容词。
第6题：该句需要修饰形容词sorry的副词，true的副词是去e再加ly。

二、根据句意，从每组所给词中选择恰当的词填空。
1.point to; point at; point out
(1)The teacher ______ my mistakes in this sentence. I have understood it.
(2)He ______the house over there just now.
(3)The teacher often _______ the blackboard and says "Please look here carefully."
2.to; towards
(1)I'm sorry, my back is _______ you.