用所给词的正确形式填空。（共5小题，每小题1分，计5分）
He tried his best ___________ (help) me with my study.
Don't give up_________ (learn) English. It is important to you.
They are foreign _________ (visit).
Please help me _________ (clean) the house this afternoon.
Would you like __________ (watch)TV?