1 . The smokers didn’t realize the risk of throwing cigarette ends on the ground. (保持句意基本不变)
The smokers were ________ ________ the risk of throwing cigarette ends on the ground.

3 . 他看起来很伤心。我和他打招呼，但他没有留意到。
He looked so sad! I said hello to him, but he ________ ________ ________ my greeting.

4 . I’m so careless that I’m ________ (aware) of the spelling mistakes in the report.

5 . 那时他完全没有意识到他所惹的麻烦。
At that time, he ______ totally ______ ______ the trouble he caused.

6 . —Some young people always ________ their parents.
—They should learn to do things by themselves.

A．depend on

B．are unaware of

C．keep in touch with

7 . —You did something wrong again.
—Sorry, I was unaware of the problem.

A．didn’t mind

B．didn’t realize

C．didn’t include

8 . 他们经常由于专心调查而没有意识到他们自己的疲倦。
They ________ ________ ________ their tiredness ________ they often focus on their survey.

9 . The child didn’t know his mistakes. (保持句意基本不变)
The child ________ ________ of his mistakes.

10 . Linda is still ________ of the seriousness of her mistake. (aware)