.Some teenagersto do some voluntary work during the school holidays..

Who is the tallest boy? —It ______ be John. John is of medium height.

Nowhere else, as his mother told us, __________ except the cabin in the backyard.

I used to eat a lot in the morning. However, I ________ used to eating anything now because I always sleep late.

Is that your bike, in front of the black one?－No. It’s ______.