用所给动词的适当形式填空。 1. Look, Mike and Tom ______ (talk) with our teacher. 2. Could you please ______ (help) me with the housework? 3. Please ______ (put) the box into your room. 4. He often ______ (help) me ______ (study) English. 5. We can't talk here. Look at the sign 'No ______ (talk)!'