It was not until dark _____ he found _____ he thoughtwas the correct way to solve the problem．

I know that half of ____ I spend _____ is wasted.

______ —Good morning, Helen.

I’m too tired. I studied very late last night. -I think you ____ have a good rest.

_______Today is a fine day,and I will go on a trip to the countryside for the fresh air _______Have fun_, and_______yesterday