A policeman knocked at the door ________ we were having dinner yesterday.
A.while B.until C.before D.because
—What was your sister doing at 7 am yesterday?
—She ________ breakfast.
A.am having B.have C.was having D.were having
The World Wide Fund for Nature (WWF) chose the panda ________ its symbol.
A.was B.be C.is D.to be
They decided ________ to help the animals in danger.
A.raise money B.to raise money
C.raised money D.raises money
—What’s the population of Tianjin now?
—It’s about ________.
A.3 hundreds B.3 hundred
C.13 million D.13 millions
Teahouse is one of Lao She’s ________ plays.
A.more famous B.most famous
C.famous D.the most famous
