21.A have
22.D must
23.C unless
24.C use
25.B
IV.1.studies
2.don't hurry
3.see
4.will be
5.gives
67.won't pass
58.doesn't stop
9.is
14.will leave
15.will visit
V.1.If he pays me tonight_____ 2.If i get a work___ 3,If you aren't careful,___ 4.If you don't study hard___ 5.If you aren't patient___