He ____ a lot of time ____ his homework every day.
—May I come in? I’m sorry I’m late.— Come in, please. But could you please tell me _______________?
—_________ nice trip to travel by air!—__________.
______ twenty minutes enough for you to get to the station?
In the past few years there ________ great changes in my hometown.
To make our city more beautiful, rubbish _________ into the river.