_____, the boy couldn't enter his house.
| A．Since the key had lost | B．The key being lost |
| C．Lost the key | D．Having lost the key |
Ten years ago the population of our village was ______ that of theirs.
| A．as twice large as | B．twice as large as |
| C．twice as much as | D．as twice much as |
The English spoken in the United States in only slightly different from ______ spoken in England.
| A．which | B．what |
| C．the one | D．that |
– Do you think Jim can manage it on his own?
– ______. He is expert at dealing with such matters.
| A．Take care | B．I’m not sure |
| C．Don’t worry | D．Don’t mention it |
You’d better report the accident immediately to ______ is in charge of the project.
| A．what | B．whoever |
| C．whatever | D．who |
Johnson suggested that the problem worth paying attention to ______ at the meeting.
| A．be discussed | B．to be discussed |
| C．was discussed | D．being discussed |