By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, ____ appeared a rare rainbow soon.

People are not allowed to smoke .

______this cake, you’ll need 2 eggs, 175g sugar and 175g flour.[ ]

The opportunity Jack had looked forward________at last when he was named chief engineer in the project.

I would like to play piano instead of playing ____ chess.