句子改写：在改写后的句中每空填入一个适当的单词，使该句与原句意思相符。

　　1．There are twenty more trees to be planted.

　　    There are ________ ________ trees to be planted.

　　2．Liu Mei doesn't want to go there on foot, and Xiao Hai doesn't, either.

　　    ________  Liu Mei ________ Xiao Hai ________ to go there on foot.

　　3．We must look after young trees.

　　    Young trees ________ ________ ________   ________.

　　4．Spring is the best time for planting trees.

　　    ________  ________  ________   ________  trees ________ spring.

　　5．China has built a new Great Wall across the north of the country.

　　    China has built a new Great Wall across the ________ ________ of the country.

答案

1．another twenty 2．Neither，nor，wants 

3．must be looked after 

4．It’s best to plant，in  5．northern  part