--- May we leave the classroom now? --- No, you ____________ . You ____________ to leave before the bell rings.
You’d better _______ the test paper before handing it in.
Nancy, sweep the classroom, _______?
The dog _______ played with you just now is _______.
Three million _______ a large number. You can make it _______.
Over fifty countries _______ the AIIB(亚投行) so far.