Over the past decades, the population in this country because of the rising birth rate, immigration and the declining death rate.

Have you ever visited the Opera House?-Yes．When I was in Sydney, I ______ it twice．[ ]

Are you still willing to lend money to your roommate—YesI have always held the________that he is an honest fellow

eat the demand to succeed, one should neverabandon his moral and social consciousness

He is new here， so we know about him.