How wise of you to come round，but why ——______ that all is right.

These old coins were made of________ and they were used in ancient China.

The subjects we have at school_____biology.

k fell off the ladder yesterday, but he is all right now.–What a lucky dog! He ______ himself badly.

When people cut down big trees, new trees should be planted. ,they will have no trees to cut down in the future.