Do you know_____about it?横线为什么不能填how to do

Do you know_____about it?横线为什么不能填how to do Do it a_____.You'll know how to do it 横线填什么 为什么what do you think of it 不能说成how do you think of it Do you consider it any good ____ again?为什么不能填to try How do you s__ it?怎么填? How many ____(课） do you have?横线上填lessons还是classes为什么? It is good -------you to do more exercice 横线上应填 on for with 为什么能说What fun it is to do sth.却不能说How fun it is to do sth. Do it how you I like to eat oranges.Do you like ＿＿?横线上填什么?为什么? how to do it? nobody told us后面为什么跟how to do it 或者what to do而不能跟how to do 或