1.People will have __robots____(机器人）in their homes to help do houework.
2.__Everything___(一切）is ready.Let's start,OK?
3.Many factories poured waste water into the rivers.So there is much water ____pollution____(污染）in our country.
4.Cities are beaytiful and big but very ___crowded____(拥挤）
5.___There's_（有）a little bird singings in the tree.