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

Has your sister visited Disneyland _____? —Yes, she has visited it ________.

There is a big cake. _______ share it.

Sam spends two hours _______ his homework every day.

In the past, ice used to ______ used to ______ the air in a room.