I don’t know if he __________ tomorrow . If he _______ here , I will call you .

They develop their skills _________ they can do things better and better.

He is always able to make us ____ in class. We usually feel happy while learning English.

The woman looks very young, but she is ________ 40.[ ]

Which of these two English books will you borrow? – I’ll borrowof them. Because they are very interesting.