Tony, would you go and see if Sam has any difficulty __________ his tape recorder?
| A．to fix | B．fixing | C．for fixing | D．fix |
The two girls are so alike that strangers find_____ difficult to tell one from the other.
| A．it | B．them | C．her | D．that |
（2011重庆卷,27﹚——Silly me! I forget what my luggage looks like.
——What do you think of over there?
| A．the one | B．this | C．it | D．that |
（2011天津卷,1﹚We feel our duty to make our country a better place.
| A．it | B．this | C．that | D．one |
We have various summer camps for your holidays. You can choose ____ based on your own interests.
| A．either | B．each | C．one | D．it |
The two girls are so alike that strangers find ________ difficult to tell one from the other.
| A．it | B．them | C．her | D．that |