Can you tell the ________ difference between the words “require” and “request”? I sometimes get puzzled by their meanings.

It is now generally believed that a good teacher should be ______ to his/her students. 

A person ________ with H7N9 viruses will be more likely to die of lung dysfunction.

She finds her new jobs very __________ but she will never give it up.

Peterson used to work in a remote mountain village school, which is only _____ on foot.