i am reading an english book at the moment-> what

14. Reading a lot of English books helps me to widen my vocabulary and understand the context _______ words are used

A.Which  B. when  C. where  D. what 

15. I have just joined an international project ______ connects students from all over the world

A. who  B. which  C. how  D. why

16. I’ve borrowed some English grammar books _______ the school library because these books explain the grammar thoroughly and provide me with various types of exercises

A. from  B.on  C. at  D. in

17. I take every ______ to speak English with foreigners because this is my weak point

A. condition  B. advantage  C. responsibility     D. opportunity