_________ is known to all，good friends _________ happiness and value to life.

Do you know _her mobile phone?一 No, I think it cost her around 4000 yuan.

Why was Miss Read so angry with you this morning?—She asked me _______.

Several students were working _____the difficult math problem after class. [ ]

There will be lecture (演讲) in half an hour.The meeting room with people.