Why do you keep the windows open on such a cold day? —There are so many students here, so we want to keep the air nice and __.

.It won’t be______he______to Taiwan for further study on computer technology.

His father looks young, but in fact he is ______.

Do you want to go hiking with me this weekend? –I’d love to. But I have to ________ my little brother at home.

You _________ get up so early. It’s weekend today.