( )21.How long has he been away.

( )21.How long has he been away.
_______.A.Two hours before B.Since two hours C.For two hours
( )22.Here is my ruler.I ______ it ten minutes ago.
A.looked for B.have looked for C.found D.have found
( )23.Have you finished your homework yet?
No,I’ll finish it in ____ ten minutes.A.another B.other C.more D.some
( )24.I went to see Tom and Bob yesterday,but_____ was at home.
A.both B.none C.neither D.all
( )25.___ of the students in our class is 67,and ____ of them like playing soccer.
A.The number of; first third B.The number of; one third
C.A number of; half D.A number of; three quarters