I am going to the post office. Do you have any letter _________?[ ]

Every time he meets with hard problems, he always ________ his parents.[ ]

Listen！Helen issinging in the next room.—It _____be Helen .She has gone to Beijing.

Every evening after work she willdrive to the kindergarten to _______ her son.

There is a saying which _______like this:, “Still waters run ______”