1.Of the two pencil-boxes,the boychose _____one.
A.less expensive B,the less expensive C.the least expensive D.the most expensive
2.My glasses are broken.I will have tobuy________.
A.a new one B.new ones C.another one D.a new pair
3.These recorders are used______studentshearing.
A.to helping to improve B.to help improve
C.to help improving D.helping to improve
.4—Why didn’t Ann come to see us yesterdayas she had promised?
----_________.
A.She must be busy B.Shemight not be free
C.She must have been busy D.She can’t be free
5._______hard all these people are working!
A.What B.What a C.How D.How a