1,＿useful work they have done!
A.what B.what a C.what an D.How
2,By the timehe was ten,he＿twenty world records.
A,borke B,has dorken C,would break D,had broken
3,Don't get off the bus until it＿.
A,will stop B,stops C,stopped D,have stopped
4,Since I was the fastest runner in my class,I was＿to take part in the race.
A,put out B,picked up C,picked out D,point out