They are similar＿＿＿appearance, but differ＿character

Taking regular exercise and eating a balanced diet are two important keys ________ good health.

The Boston Marathon bombings killed 3 people, including a Chinese citizen ________ Shenyang.

—How amazing it is that astronauts are exploring outer space!
—It's a challenge, I guess, ______  man against nature.

Children need friends ______ their own age to play with.

We do not think the twelfth five­year plan for our city is practical ________ recent developments.

This urban special school always accepts hearing­impaired students, ________ their educational level and background.

She's got the job because she has the advantage ________ others of knowing many languages.

Most Americans would prefer to keep their problems ________ themselves, and solve their problems ________ themselves.

I'm working this evening because I am ________  schedule with my work.