The first decade in the 21st century is the one ________ many significant advances are made in China.[ ]

Not until I began to work ________ how muchtime I had wasted.

－Jack, why are you late again?－Sorry . My car _______ on my way to the company.

Must I come at four o’clock— Oh, no, you ________.

my parents have promised a 2 – day trip this weekend for my good performance-CoolYou a good time then