问题
1.-Do you think aliens _____ on the earth
-Yes ,I do
A.can be found B.can fing C.be found .D.will find
2.This brush is used ____
A . to writing B.for writing C.write D.as writeing
3.The machine is broken ,and it ___-fixed up sometime next month
A.may be B.maybe C.has been D.be
4.lei feng was always ready to help others ____their work
A.to finish B.finish C.finishing D.A or B