In such a _________ night, the _________ people couldn’t fall into sleep.

Many rules in English are ______, and large numbers of students feel ______ them.

“Cell phone” is a     American usage，but British speakers always use “mobile phone”．

——John always thinks of others instead of himself.—— So he does. It is _______ of him to want to help others.

I think whoever makes____contributions to the company than the others should get _____income.