Before any passenger can get on an airplane at the airport, he must go through security checks to make sure he （）anything dangerous.

People have to know how to control money; （）, it can co...

单项选择题People have to know how to control money; （）, it can control them.

Another thunderstorm slammed （）the mountain as I limpe...

单项选择题Another thunderstorm slammed （）the mountain as I limped up the path to the house.

I had trouble understanding the French, so I got the En...

单项选择题I had trouble understanding the French, so I got the English （）of the book from the library and read it.