______ do you write to your pen-friend? —”Once a week.” [ ]

I believe _____ important to have a rest when you feel very tired.

Whose backpack is this? —It be Jim’s. Look, his student’s card is in it.

It’s difficult for the village children to cross the river to get to school.— I think a bridge ________ over the river.

Add some sauce _____the fish. [ ]