Her father often _______ to work on foot. But yesterday he ________ a bike.

Every morning, I get up at six o’clock, ________ and have a quick breakfast.

It _____ last week that the haze(雾霾)in Beijing caused many problems.

Can you go to row a boat with us this afternoon? – I’m afraid not. I_______ look after my little sister because my mother is out.

Good news! The price of all those second-hand goods is ______ before.