1. We have made _______great progress in the medical field, but ______ progress we have made is not enough.
A. a; a B. a; the C. /; the D. /; /
2. The old town has narrow streets and small houses _______ are built close to each other .
A. in which B. where C. what D. that
3. Auckland is a most exciting city with people of many different cultures ______ there .
A. live B. having lived C. lived D. living
