听对话，选择正确的答语。
1. Where does the rain come from?
A. It comes from the river.
B. It comes from the clouds.
C. It comes from the vapour.
2. How do you do that?
A. Plant the seeds.
B. Water the soil first.
C. Put the seeds in the soil first.
3. When can I see the sprout?
A. In several months.
B. In several days.
C. In several hours.
4. What should you do then?
A. Dry the soil.
B. Wait for it.
C. Water it.
