用所给动词正确形式填空 They often ________ (do) their homework at school. Look! The cat _____________ (run)up the tree. Let's _________ (have) supper. Thank you very much for _____________ (give) me a very nice bag. He would like __________ (go) shopping. Listen ! The children____________ ( sing ) in the classroom. He ____________ (not speak ) Chinese. Mary likes___________( read ) very much. The animal usually sleeps and ________(relax)20 hours every day. I want ___________ (work) in a post office.