All we have is 24 precious hours a day and therefore we shall waste ______
68 It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
69.I like ____ in the autumn when the weather is clear and bright.
70. -Do you like ___ here? -Oh,yes. The air,the weather,the way of life. Everything is so nice.
71.The Parkers bought a new house but ____ will need a lot of work before they can move in.
72. I hate___ when people talk with their mouths full.