___________ sister is in Beijing .
| A．My mum | B．My mum’s | C．My mums’ | D．My mum’ |
Several days has passed_______the air crash（空难） happened.
A.since B.after C.as
In our school libray,there____a number of books on science and the number of them_____growing larger and larger.
A.is;are B.are;is C.have;is
They preferred_____ rather than_____a bike.
A.to walk; to ride B.walking;riding C.to walk;ride
You______be tired after playing sports for a long time without a rest.
A.must B.need C.can’t
_____the afternoon of April 30th,many foreign visitors arrived___Shanghai.
A.In; B.On;in C.On;to