People in China don’t like hugging each other when meeting, which _________ a common __________ in some European countries.

 To tell the truth, what you said was too ________ for us to understand.

No matter how low you consider yourself，there is always someone ________ you wishing they were that high.

The kitchen is often the busiest room in a household, so it’s important to make sure it      well.

 At present  ________ of the experiments  ________done in labs after the new building has been finished.