用所给动词的适当的形式填空。
（1）David is         (pass)the ball to Ben．
（2）I'm      (pull)up carrots in the garden now．
（3）The g]asses         (be)there a moment ago．
（4）I like      (milk)cows on the fatal．That’s fun!
（5）一Did you       (visit)the farm?  
一Yes, I       . I       the farm．
（6）一What        (do)you do last week?
—I       (go)to the zoo with nay family．
（7）Look! The boys        (pick)a lot of oranges，the girls           (taste) them．
（8）We shouldn’t      (walk)on the grass．