用完整的句子补全对话
A: Hi, Tom. ____________________?
B: I have been to Beijing to see my pen friend David.
A: Really? _____________________?
B: He is a doctor in a hospital in Beijing.
A: ____________________?
B: I got to know him on a train.
A: ____________________ ?
B: He is tall and strong and wear glasses.
A: ___________________?
B: He is kind-hearted and nice. I am lucky to be friends with him.
Look! The Browns （eat） supper in the kitchen．
Cathy and Linda （ not be） back to their hometown for two years．
There are some boys （swim） in the river now． It's very dangerous．
The （careful） you work, the fewer mistakes you'll make．
Chinese parents try their best （提供）a good environment for their children．