Power is a function of （ ） . A: satisfaction B: Strength C: authority D: dependency

He __________ on his wirting for his income. A: dependency B: dependent C: depends

The Internet was designed for convenience and _______not security. A: reality B: dependency C: independency D: unreliability

He had gone to the reception desk, presumably to ______. A: check on B: check into C: check off D: check out

How to check the quality during production（） A: Check every one. B: Take samples to check it. C: Check it at random.

To show your ticket and get your seat at the airport is to _________. A: check out B: check off C: check in D: check on

Could you please _______over there in the front office? A. check in B. check off C. check on D. check about

We worried about his dependency[input=type:blank,size:4][/input]his mother.

What do you have to do before leave hotel（） A: check out B: check in C: check ove D: check on

You must_________at the airport an hour before your plane leaves. A: check in B: check out C: check with D: check over