27.【单选题】“心诚则灵，心不诚则不灵”的说法是（）。

There will be some air ____ in 10 minutes. Please return to your seat and fasten the seat belt.

Passengers are required to be at the airport 2 hours ____ departure.

Because of this, the economy is ____ to get worse.

The pilot was seriously injured and the ____ would take over.

A ____ of 20,000 people came to the concert.

What＇s the ____ rate between US dollar and Pound?

The customs officer caught a ____ dealer at the airport.

____ is an item that is not legally brought into the country.

She is very ____ and always cares about other people＇s feeling.

The bags are stored in the cargo ____ of the aircraft.