Gina _______my cousin．We _______good friends．

---You could have walked here.---Yes. A taxi ___________ necessary.

The number of people invited __________fifty, but a number of them__________ absent for different reasons. 

Since the forest has been destroyed by a big fire, a large ______ of trees ______ to be planted on the mountain．

There _______ a mother ,a father and three  children in the family.