Zhurong，China's Mars explorer， （land） safely on the red planet in May 2021，making China the third nation to do so in human history.
The Value of a Dollar
When I was nineteen，I had a job at a local bookstore．One night，a young couple came in and walked here and there looking for a book．They seemed（1） （be） the usual type to give mall（2） （worker） a hard time．When they came to the register （收银处），she was a dollar or two short of（3） （buy） the book she wanted．
She looked（4） （disappoint）．I had a customer discount （折扣） card and it was still active．I told the girl（5） （gentle），"Hang on，don't worry，you'll have the money to buy the book．"I put in my password．
She gave me a（6） （thank） smile．With a dollar left，she and her boyfriend left the store．I believed that I would never see（7） （they）again．
I don't remember（8） long it was，but they did return later that evening just to bring me（9） beautiful card that said"It's people like you who make the world a（10） （good） place to live in．"
I'm deeply moved by the little girl and her boyfriend．Infact，they have also made the world a little brighter．
Don't be （害怕） of making mistakes in life，because you can improve yourself by correcting them．
It's very helpful to （讨论） your problems with your parents．
Believing in yourself is the first step on the road to （成功）．
Mike is so smart that he can answer these questions （容易地）．