_______ the fact that three quarters of the earth’s surface is covered with water, we can say that it is a ________ planet.
— __________ when has the country been open to international trade? — 1978, I suppose.
— I think he is taking an active part in social work. —I agree with you __________.
I have offered to paint the house __________ a week’s accommodation.
I _____ you yesterday, but you weren’t in.
—I usually go there by train.—How about _____ by boat this time?