I.put the right modal verb (must, may/might, need, should, can/could). 1. i suppose you … think about your future not about the past. 2.… i borrow your book? 3. it was so quiet that one … hear a leaf drop. 4. you … worry, everything is ok. 5.… we go out?
2.may
3. Could
4. Needn't
5. Can