No one helps us, so we will do it all ______ ourselves.

－Where did you go _____ the morning of April 6?
－I didn’t come to the office _____ the meeting was over.

China successfully sent the Shenzhou-8 spacecraft into space _______ November 1, 2011.

— Is Mr. Brown at home now?
—Yes. He usually does exercise______ 7a.m. ______8a.m. in the garden.

We should throw the rubbish into the dustbin ______ protect our environment.

To film fans’ delight, ‘Titanic’ in 3-D returned to Chinese screen ______ April 10, 2012.

If you try to smile _______ life, you’ll always be _______ a good mood.
A. in, in                  B. at, in                    C. in at

A: When did the Shanghai Expo open?
B: ___________ May 1st, 2010.

I have kept the book _______ the morning of May 1.

The  roller coaster there  moved _______ high speed.