Some foreigners will visit our school tomorrow.—Great! It’s ______to tide up our school now.

If we don’t save energy, it _____ some day.

What would you rather do, take a walk or swim?–I taking a walk swimming.

Apple’s i Phones _____easy to learn. Many young people can use them well.

There will be lecture (演讲) in half an hour.The meeting room with people.