We must clean up ________ classroom before going home.
we
us
our
ours
People in Lanzhou are glad that a modem subway in several years.
()There _______ a charity show at the school hall next week.
—Why are you in such a hurry, John? —There _______ an NBA basketball game in ten minutes.
I _________ think there _________ be more buildings in two years.
There______ a sport meeting in our school this weekend, isn't there?