— How long have you known John? — Since he ______ to our class.

The traffic in our city is already good and it ＿＿＿even better. 

I ran across David while walking along the street yesterday. I ________ him for three years.

----How long      in hospital? ----One more week at most. He is quickly recovering.

In order to find the missing boy, the young couple            all they can over the past twenty-four hours.