.We didn’t find the Blacks during the lecture. — No one had told them about _____ a lecture.

Her aunt is very busy. She works _____. [ ]

As the intelligence of robots increases to match ________ of humans，we may use them to expand our frontiers.

I missed the beginning of ________musical programme The Voice of China. —What a pity! You should leave school half _______ hour earlier.

Could you tell me ________?—Sorry, I don’t know, but I’ll call you as soon as she tells me.