You look unhappy, what’s happening, my son? —I’m wondering how long it’ll be________ we come to China again.

This is ________ one-eyed sick animal that needs ________ X-ray.

Dear me! What a wonderful computer! —My grandpa bought it for my sister and me. It’s ______.

There are many apples ______the tree.[ ]

My brother ______singing ______ dancing while I _____ dance _____sing.