________ great fun I have _______ Frisbee（飞盘）with my dog! He can always catch it quickly!

Let your child learn to be independent, for _____ hewill leave home to lead his own life as a fully independent adult.

第一部分：单项选择—Make sure you have turned off the air conditioners before going out—_______________

Taking regular exercise and eating a balanced diet are two important keys ________ good health

Why isn’t he in the hospital with his injured mother?—No one ______ him of the accident