Scientists are now working _ humanoids(类人生物) because they can help people alot. [ ]

do you go to visit your grandpa?—Once or twice in a week.[ ]

I think robot will play an important role in our life. Don’t you think so?—Yes. _________________________.

Nanjing, the ancient capital of the six dynasties, is becoming ________ international city and attracts more and more foreign tourists every year.

Why do you look so tired? －The noise upstairs made me the whole night.