What does the model have in her hands—She has ______umbrella in her right hand and_____ useful book in the other.

Battery-operated slippers are used ______ seeing inthe dark.

How are the kids spending their childhood? I can’t help recalling（回忆）that there was a time _______ we played happily and freely in the outside.

The organizers promise ________wins the first prize a chance to go abroad。

The Great Wall of China is _______ wall in the world.