用can 或can't填空，完成句子。1. A duck _________ swim. A chicken _________ swim.
2. A bird _________ fly. A pig _________ fly.
3. A donkey _________ run. A horse _________ run.
4. A rabbit _________ write. A boy _________ write.
试题答案
1. can, can't 2. can, can't 3. can't, can 4. can't, can