用括号里所给动词的适当形式填空。注意:每空不限一词。
He often ______________ (study) with his friends in the library after class.
We should do more exercise ________________ (keep) healthy.
These magazines must not ________________ (take) out of the reading room.
-- I called you this morning, but nobody answered it.
-- Oh, we ________________ (run) in the park.
Jacky Chen ______________ (star) in many action films for many years. I admire him very much.