Why are you so happy?—That’s because an old friend of is coming.

There _______ two basketball matches on TV this evening.

It’s said that the famous scientist will give us _________advice on maths study. —__________good news! I’m not good at it.

Is your ipad white, Mandy? —No, it isn’t. _______ is black.

Why is the classroom so dirty?—Sorry，sir. Ityesterday, We forgot to do it.