--- Could you tell me ? --- Certainly. In half an hour.
— What’s your plan for this weekend? — We will go for a picnic by the river _______ it rains.
—Why was he late for school yesterday? — He overslept. By the time he got to the bus stop, the bus ________ already ______.
—Heavy smog (雾霾 )in eastern and central China seems to get more and more serious. —I agree. Something to deal with it.
— Who is your favorite writer? — Mo Yan. I like writers _________ tell stories well.
Tom finds _________ difficult to learn Chinese well.