.Traveling by plane is the most comfortable ， but it is also the _________ .

Some people feel easy and comfortable to be served by others but when they are asked to serve others ______, they are unwilling or even hate to do so

The number of the cranes is getting ______.If we don’t help them, they will disappear ________a few years.

“Where is it?” “Where is ____? I don’t know what do you mean?”

______ special gift you bought for me!