把句子变成被动语态或主动语态

1。The windows are opened by my brother every morning。2。The room wasn't cleaned by her this morning。3。Is English spoken by them in America?4。The young people loved the actor。5。She doesn't wash the clothes。6。What did they find?7。An interesting book was given to her by Bob。8。Some pencils were bought for his children by him。9。I am called Xiao Wang by everyone。10。A doll is being made by Mary。11。Such fine music can't be coposed by her。12。The tree was being cut down by my mother。13。The letter hasn't been received by him。14。The room was being cleaned by somebody when I arrived。15。He is often heard singing by us。16。He is believed to be a great scholar。17。I was made to go there alone by my father。18。The truth will be known soon by everybody。