用括号里所给动词的适当形式填空。
(1)He often ____ (study) with his friends in the library after class.
(2)We should do more exercise ____ (keep) healthy.
(3)These magazines must not ____ (take) out of the reading room.
(4) I called you this morning, but nobody answered it.
Oh, we ____ (run) in the park.
(5)Jacky Chen ____ (star) in many action films for many years. I admire him very much.
