If you want to talk to your teacher, you should _ _first.

to the best of his ability.

Go for a picnic this weekend, OK– ____. I love getting close to nature.

Liu Tao is always ______to bring his homework .—-You see ,he has ____it at home again .

Nowadays, many people______ the theory that acupuncture is related to the production of chemicals in the body which reduce pain.