Thanks for answering my question about "there's v.s. there are" as well as "runny nose v.s. running nose".
Here is another question about adjective clause:
(1) Peter is one of the boys who have blue eyes.
(2) Peter is one of the boys who has blue eyes.
I told my students I would use the fist sentence instead of the second one. Please tel me which is correct. Thanks a lot.