--I can’t solve the math problem because it is too difficult. What should I do? -- _________ ask the teacher for help?

A: __________ do you use your computer?B: I use it in the evening.

I don’t have to introduce him to you ________ you know the boy..

Money is important ______ it’s not the most important thing.

Mr. Wang is always the first one to be in the office ________ he lives far from his company.