the policeman kept his eyes _________ on the screen of the c

the policeman kept his eyes _________ on the screen of the c The policeman kept his eyes------on the screen of the on the The policeman kept his eyes____on the screen of the computer He kept on _____his eyes with the back of his hand 单项选择 （英语） The policeman kept his eyes open for a long time b he boy with his eyes fixed on the screen was oblivious()the his flat is on the _________ of building （twelve） on the screen什么意思 all eyes were on the TV when the screen suddenly became blac he went out of the office,with his eyes A fixed B kept选什么,为什 _______ _________ _________(所有的电影院）are good,but the screen c 请问是on screen还是on the screen?