They held a ceremony ________ those killed in the battle.
---- How about your journey to Mount Emei? ---- Everything was wonderful except that our car ___ twice on the way.
Would you please ___ the paper for me and see if there are any obvious mistakes?
Once out of the earth’s gravity, the spaceman is ___ by the problem of weightlessness.
I admired my classmate Lisa very much. _____ her prettiness, she was smart and helpful.
The boy is lying on the ground, _________ at the aeroplane in the sky.