It______last week that the haze(雾霾)in BeiJing caused many problems.A. was reportedB. is reportedC. reported
—Dad, do I need to bring a raincoat with me ? —I’m afraid you .
—Did you see him yesterday? —No, when I got to the airport, he a taxi for home.
The old scientist devoted most of his time ___________ the space science.
_________good advice! It’s so helpful to us.
—Mary was heard_______ just now. What happened? —John was telling a joke.