Mr. Smith is very kind-hearted as well as responsible, so you are __________ to have such a good teacher as he is.
He ____ busy then; otherwise, I believe, he would have given you a hand.
It is not like Mr.Smith, who is a gentleman, _____his wife so rudely.
As the saying _______, _______ who laughs last laughs best.
An increasing number of people enjoy sun-bathing, but experts warn that too much ________of the body to strong sunlight is harmful.
----Thank you for the trouble you ______ to fix my computer. ----__________!