The old couple _______happily at their home when I walked past yesterday afternoon.
A. heard singing B. heard to sing C. were heard singing D. was heard to sing
---I’m sorry. There was too much traffic on the road.
---Never mind. The meeting _______ for only 5 minutes.
A. has begun B. has stopped C. has been on D. has finished
We should plant more trees because they can keep the soil _____ place.
A. to B. with C. in D. on
---______ will we arrive at the airport?
--- In two hours.
A. How often B. How long C. How far D. How soon
He has made _______ great progress _______ his mother is very pleased with him.
A. so; that B. enough; to C. so; too D. such; that
---Who is knocking on the door?
---It ____ be the milkman. He sends the milk to me every day.
A. should B. can’t C. must D. need
