1 . —How crowded Meili Town is!
—Yes, the number of the tourists has kept ________ greatly since last year.

A．rising

B．raising

C．improving

D．developing

2 . The old man exercises every day __________(improve) his health.

3 . We’re in no doubt that the environment ________(improve) by our efforts to reduce pollution.

4 . We improved the situation by stopping factories from putting waste into the rivers. (对画线部分提问)
________did you________the situation?