2 . ________ about the unexpected sense, I left the room without any words immediately.

A．Embarrass

B．Embarrassing

C．To be embarrassed

D．Embarrassed

3 . The cars made in this city are more expensive than ________ made in that city.

A．ones

B．these

C．those

D．them

4 . The environment won't be getting better ________ the majority of us take steps to reduce waste and pollution.

A．since

B．unless

C．if

D．once

5 . You'll imagine what difficulty we had ________ home in the snowstorm.

A．to walk

B．having walked

C．walked

D．walking

6 . —Susan, would you like to go to the movies with me tonight?
—I’d love to. But I ________ Mary I’d go with her yesterday.

A．promised

B．promise

C．was promising

D．had promised

7 . He’s having a lot of trouble with the new machine, but he doesn’t know whom to ________.

A．turn to

B．believe in

C．look for

D．deal with

8 . You are old enough to ________ your own living.

A．win

B．take

C．gain

D．earn

9 . While running regularly can’t make you live forever, the review says it is more ________ at lengthening life than walking.

A．sensitive

B．effective

C．generous

D．limited

10 . The doctor share his phone number with the patients in case they need medical ________.

A．confirmation

B．assistance

C．contribution

D．shortage