Susan, ______ university student from Europe, teaches me ______ art in her spare time.
| A．an; 不填 | B．a; the | C．a; 不填 | D．an; the |
You may use the book as you like, _______ you keep it clean.
| A．unless | B．so long | C．as long | D．so long as |
"Do you have any clothes to ______, Tom?" mother asked.
| A．wash | B．washing | C．be washed | D．washed |
When will you _______ me the money that was borrowed?
| A．pay | B．repay | C．pay for | D．repay for |
I insisted that he_______ at once.
| A．leave | B．left | C．leaves | D．leaving |
I looked everywhere in the house ______ a key that had been lost.
| A．in searching for | B．in search of |
| C．to search | D．searching of |