【题目】 my mother was cooking, I was listening to music.

【题目】Li Yang wants to work on the space program, he can’t be an astronaut.

【题目】The book is worth .

【题目】Our grandparents hardly have a meal in the restaurant，___________？

【题目】Uncle Peter took up French during his stay in Paris last year. Here the underlined part means “___________”.

【题目】—___________ is it to travel from your home to the school？

【题目】Mary's teacher told her in class that the Earth ___________ around the Sun.

【题目】Tom has got used to ___________ a glass of water when he gets up in the morning.

【题目】The stormy weather made the flight ___________ taking off until it became clear.

【题目】Something necessary ___________ to prevent the serious air pollution.