Three-quarters of the land 　　　 covered with green grass while the rest ______ covered with

pine trees.

　 A. is,is　　　 　 　　B. is,are　　　 　 C. are,is　　 　　　　D. are,are

1、生活中困难不可避免，面对困难需要信心…

　　2、试举一例说明信心在学习(考试、生活等)方面的作用…

　　3、你对困难的态度…

—There is still a copy of the book in the library. Will you go and borrow 　　　　 ?

—No, I’d rather buy 　　　 in the bookstore.

A.it;one　　　 B.one;one　　　　 　 C.one;it　　　 D.it;it

It is pretty well understood ____controls the flow of carbon dioxide in and out the atmosphere today.

A. that 　　　　　　 B. how 　　　　 C. when 　　　 D. what

The flood and the infection ________ brought along really made the4 villagers suffer a lot.

　 A. it　 B. that　 C. which　 D. what

—When did you come back?

—An hour ago. You　　 the computer games.

A. have played B.were playing C.played D.had played

It looks as if they are going to ___ us 3,000 dollars for the concert hall.

　 A. want　 B. cost　 C. demand　 D. charge