By the time the fire-fighters arrived, the fire had been put＿＿＿by the teachers and the students. 

When you drive home, you can’t be＿＿＿＿＿＿＿careful. 

In my opinion, she is too young to take care of the pet dog ______.

When they knew there was a panda in the zoo, the children could _________ wait to see it.

Our bodies are strengthened by taking exercise．_______ our minds are developed by learning．