—It's dangerous to swim in this river.—Yes,you are right.The government has ______ people not to swim in it.
Although he is very old, ______ he works very hard
It’s cold, so we decided ______at home.
I didn’t go to the mountains ______the bad weather.
---______ was your vacation? --- It _____ exciting.
There is ________ wrong with his eyes. He can’t see things clearly.