夹芯蜂窝结构在B737飞机上主要用于什么结构或部位?

To keep health, we have to keep _______ hours.

He spoke so quickly that I didn t _________ what he said.

Both the Bible and the Koran are regarded as ________ books.

The need for reform was ________ . No wonder a large number of people came up with their opinions.

He was set free because the police didn＇t get ________ evidence to convict him.

Computers have taken the place of manpower in _______ years.

The clock strikes three, so it is three o＇clock ________ now.

The green leaves ________ more beautiful after the rain.

Because nobody opposed the plan, the meeting went on ________.

A large _______ fell and blocked the road.