Thanks for asking me to your party, Rosa.

Do you have enough students to carry the boxes?—No, I think we needstudents.

It’s ten o’clock. Betty _______ piano.

I saw you come to school by bus this morning.—Oh, I _______ come to school by bus, but it is raining today.

Is air the lightest thing in the world?– Not . Scientists from Zhejiang University have just developed the world’s lightest material.