1. ______ is known to us all, ______ water and air are harmful to people’s health.
A. That; polluting B. Which; being polluted C. As; polluted D. It; to pollute
2. It's going to be ______ difficult job but I'm sure she'll rise to ______ challenge; she is a determined person, after all.
A. a; the B. 不填；a C. the; a D. the; 不填
3. -- It is so kind of you to have ______ $ 2,000,000 to the fund.
-- Don't mention it - it is a pleasure to be able to join you in helping people ______ need.
A. spent; on B. contributed; in C. cost; for D. squeezed; against
