6, The mother asked her daughter where she had been the night before.
7, Her little sister kept talking during the film last night.
8, The children prefer watching the internet to reading books nowadays.
9, She does not waste money on something she never uses.
10, Now, we are very busy for the exam. If we had more time, we would go shopping.
11, He is the most selfish person I have ever met in my life.
12,The hat, which I bought, was much less expensive than the others in the store.
13, We stayed at that cottage very late until it stopped raining.
14,She asked her boyfriend which trousers he liked best.
15,He told me to close the door behind me.
16,Would you mind giving me a hand to prepare for the party next Friday?
17,The film is based on a best-selling book by the young author Alex Garland.
18,The harder you study, the better your result will be.
19,Hanoi, which is the capital of Vietnam, has been developing rapidly in recent years.
20,If I were in your situation, I would take a course and learn Chinese earlier.