用单词的适当形式填空。 |
1. My aunt _____ (teach) me to play the violin when I was a child. 2. Look! The people in the river ______ (swim). 3. Tree-planting Day is on the ______ (twelve) of March every year. 4. Stephen spends about half an hour ______ (swim) every Saturday afternoon. 5. I don't like travelling by train. I think it's ______ (safe) to travel by train. 6. —I'm tired. —So am I. We'd better stop ______ (walk) and have a rest. 7. Plants need CO2 when they grow, so they can make CO2 ______ (little) in the air. |