-Mike wants to know if_______ a picnic tomorrow. -Yes. But if it_______, we'll visit the museum instead.
—What’s your hobby? —I _______ listen to music, but now I enjoy dancing.
The old man died _______ a cold snowy night.
He is _______ young _______ to school.
—I think computers are _______ more important than radios. —I don’t agree with you.
I’m if there are UFOs.(飞碟)