Rewrite the sentences.按要求改写下列句子。
1. It's cold in winter. (对划线部分提问)
________ is the ________ in winter?
2. The ducks look into the water. (改为一般疑问句)
________the ducks ________ into the water?
3. Joe’s father swims in the river. (改为否定句)
Joe’s father ________ in the river.
4. Are they ugly? Are they beautiful? (改成选择疑问句)
________ they ugly ________ beautiful?
5. Can the swans fly in the sky? (根据实际情况回答)
________, they ________.