What’s this in English—It’s an ________.

So difficult __________it to live in an English-speaking country that I determined to learn English.

Are you different _____ your friend, Mary—No, we are similar ____ each other! We like to do the same things.

Having a walk after supper is certainly good for the old people, but it remains ______ whetherthey will enjoy it.[ ]

How I regret _______ when my father told me not to play computer games!— You’d better say sorry to him.