There are six floors _______ our school buildings. Our classroom is _______ the third floor.
| A．in; on | B．in; in | C．on; in | D．on; on |
The People's Republic of China ______on October 1, 1949.
A. found
B. was founded
C. was found
______ weather stops me, I go for a walk every day.
A. Unless B. If C. As long as
---May I go out to play with my friends now, Dad?
---No. You ______ let your mother know first.
A. may B. need C. must
Look! So many passengers on the underground ______ their phones.
A. play
B. are playing
C. have played
I really can’t see anything, the student in front of me is ______ of my view.
A. on the way
B. in the way
C. out of the way