1. — Smoking is danger to health.
— So it should be banned in public places.
A. a; / B. /; the C. a; the D. /; /
2. She has changed a lot. It took me quite a while to her at the party.
A. introduce B. recognize C. avoid D. know
3. Cocaine is so addictive a drug many people become addicted to it once they start using it.
A. when B. which C. that D. unless
