sa b c 2. Choose the answer! Read the sentence. Circle the correct answer. You must pay attention at school. to pay (pay) paying 6. You must.... quiet in the library. be / to be / is C. You mustn't..... across the road running/run/ran d We.... shout in class. mustn't to / must no / mustn't She.... help her brother with his homework must to / must / musts f. You must.... after your pets. looking / to look / look 9 We mustn't... a mess when we paint! to make / made / make h. He.. keep his bedroom tidy. must / must to /musts​