— is the Amazon River?— Some experts say it’s 7,025 kilometres but others say it’s 6,440 kilometres.
The old man is ______ weak ______ say any words.
We should try our best _______ poor children _______ clean water and food.
You’d better go out for a walk instead of _______ in your bed.
____________ is enough money to carry on with our work.
It is really nice ___you ___ me work out the problem.