the big crowd coming towards him, he started to run down the hill，but____ and went down on his hands and knees in the melting snow.

Alice likes listening to____ music while Joan is fond of surfing on ____Internet.

Is there an express to Beijing tonight? — There _____ be, but you’d better call the booking office to make sure. [ ]

He made a mistake, but he took action to change the situation________ it got worse.

Where is your mother— She _______ to Sichuan on business. Shehas ______ there four times recently.