—Would you mind my opening the window to let some fresh air in?
—Not in the least. ________.
| A．Come on | B．Take care |
| C．Go ahead | D．Hold on |
The power failure made ________ difficult for us to complete the task on time.
| A．that | B．it |
| C．one | D．this |
Usually there might be a lot of accidents in the heavy fog.I happened to witness ________ this morning.
| A．it | B．those |
| C．each | D．one |
Surprisingly, Susan's beautiful hair reached below her knees and made ________ almost an overcoat for her.
| A．them | B．her |
| C．itself | D．herself |
When you are done with the book, just give it to Lucy or Helen or ________.
| A．whoever | B．wherever | C．whatever | D．however |
Half of ________ surveyed in 16 countries say they go first to their closest friend to share their deepest wishes and darkest fears.
| A．these | B．some |
| C．ones | D．those |