____interesting experiment it is!
| A．What | B．What an |
| C．How | D．How an |
To our surprise, the walls of the new bookstore ____books.
A. are lined with
B. is lined with
C. have lined with
In English, we say that sharing a problem is like cutting it ____.
A. into half B. in half C. by half
-- What will happen ____ we hold the party next Monday evening?
-- Most of our classmates will not come.
A. if B. though C. since
-- ____ do you play chess?
-- I play at least twice a week.
A. How much B. How often C. How long
Many volunteers will help to ____ the city parks next Friday.
A. give up B. pick up C. clean up