Question

Hes changed a lot ... he left school
A)for B)since C)During D)that
Helen ... leave the meeting early because she had a train to catch
A)must b)should c)had to d)has
If she ... her driving test, she would have bought a car
A)would have passed B)Has passed C)Had passed D)passed

Answer 1

1. b.
2. c.
3. d. 
...........

Answer 2

Since
Had to
Had passed