— Why not swim in this river?— My father told me here. It’s dangerous.
He used to ____in the sun, but now he is used to ____at night.
My father isn’t in good health now. I think he should pay attention____ exercise.
You should keep working hard __you have passed the exam.
During the Spring Festival Chinese usually ___much time ___their relatives and friends.
My father told me he _____ me to the Great Wall next week.