—How wonderfully Jim is swimming in the pool!—It ______ be Jim. I am not sure.
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.