Fill in the blank with a suitable preposition. 1. The United Nations Security Council is comprised _____________ five permanent members: Russia, the United Kingdom, the United States, France, and China. 2. It is compulsory _____________ all motorcyclists to wear helmets. 3. I’ve been corresponding _____________ several experts in the field. 4. He knew he could depend _____________ her to deal with the situation. 5. A sentence can be divided up _____________ meaningful segments. 6. We divided the work _____________ us. 7. He impressed her _____________ his sincerity. 8. It is impossible to separate belief _____________ emotion. 9. A penfriend or a pen pal is a person that you make friends _____________ by writing letters. 10. It is important to keep _____________ touch _____________ the latest research.