—Did they clean the house yesterday?—________,They cleaned at five o’clock.
She saw a lot of boys ________ football on the playground when she walked past (经过).
The famous movie star was born ________ July, 1998.
The Changjiang River is one of ________ in the world.
________ the party, we sang a song together.
It takes ________ half an hour ________ on my bike.