1 . 根据句意，选择单词或短语并以其适当形式填空。

give birth to,   in time,   for the first time,   lay eggs,   in turn

1. Jane has just ________ twins, so her mother must be in the hospital looking after her now.
2. He lost a game ________ in two years.
3. The cuckoo (杜鹃) ________ its ________ in other birds’ nests.
4. We students clean the classroom every day ________.
5. Work hard at your lessons, and you are sure to make progress ________.