----Jack, is maths difficult to learn in High school? ----Sure. No subject can be learned well __________hard work.
He told me he had finished the work ______.
What a nice day! You are not busy today. ______ go to the park with Sam?
The weather in Beijing is ______ than ______ in Nanjing.
Jim came into the room ______ Millie sat down on the chair last night.
The two children always disagree. They often argue about what TV programmes ______.