Susan, _______ university student from Europe, teaches me _________ art in her spare time.

A. an; /        B. a; the           C. an; the          D. a; /

Five years ago her brother was __________ university student of __________ physics.

A. a, the                          B. an, the

C. an, 不填                      D. a, 不填

Money plays______ important role in the material world. But expecting ______ money to give happiness may be missing the meaning of life.

A. a; the               B. an; /                C. a; /             D. the; the

 Smith asked you to repeat     phone number     second time so that he could set it down.

A. the; the          B. a; the               C. an; a        D. the; a

It is likely that water is not ____ endless resource, nor ____ that can be made once more.

A. the; /        B. an; one          C. an; that        D. /; one