1．Since nobody gave him any help, he must have done the research on his own.
2．He said，“It is just a start, and I hope I can be better and better in the future.”
3．I just can’t help thinking of both of you and want to express my thanks to you.
4．Fish must live in water, or they will die without water.
5．As technology develops very rapidly, we should learn to keep up with the changes.
6．When the Browns lived in the countryside, they would walk in the woods on weekends.
7．Do as I tell you and you shall be set free.
8．We should think carefully to these ratings whenever we go shopping.
9．Mary could play the violin when she was five.
10．(2018·北京卷)Some online courses of spoken Chinese can be helpful for you.
11．Washington should know by now that China will never give an inch.
12．When my father worked in Shenzhen, he would go for a run before breakfast.
I'm busy, so I have to employ a housekeeper to look(look) after my children.
