Paul is his mother. He reading, too.

My mother is a nurse(护士) and is good _____ kids.[ ]

On the 40th Earth Day, Dr Wang gave us a talk on the importance of ______ the earth.

Who’s the girl in red?—Sorry, I don’t know ____. —____ is a new student.

__________ have you been in the sports club?—Since the first month I came to the school．