This kind of MP5 is my favourite, but I can’t________ it.

We have to learn __________ words this term..

The teacher asked the boy many questions, but he only answered ______ of them.

Helen and Mary are good friends. _______often help each other.

I’m a little weak in Maths. I don’t know how to improve it. — Why not __________ Daniel for help? He’s very good at it.