【题目】Everyone should learn about the world.

【题目】Remember this, John. ______ careful you are, ______ mistakes you will take.

【题目】The boss(老板) makes the workers _____ these machines(机器) for ten hours a day.

【题目】Many people send cards by e-mail because it’s much ________ this way.

【题目】If you have headaches often, you need _______ .

【题目】Bob never does his homework ________ Mary. He makes lots of mistakes.

【题目】Jim's parents enjoy _____ in the countryside.

【题目】I don't mind picking up your things from the store. _______, the walk will do me good

【题目】 Daming hasn’t learnt singing _____ dancing.