Both rice and wheat ____ grown in thatcountry.

Wind is now the world’s fastest growing ________ of power.

If we had begun to do the workyesterday morning, we _____ ourselves just like them．

Billy is so tired _____ he worked all night in his office.

You didn’t wait for Mr. Black last night, did you?——No, but we ____. He didn’t return home at all.