________ begin their existence as ice crystals over most of the earth seems likely.
A.Raindrops
B.If raindrops
C.What if raindrops
D.That raindrops

I can’t decide when ________ .
A.I was leaving
B.leaving
C.left
D.to leave

Art critics do not all agree on what _______ a painting great.
A.qualities make
B.are the qualities for making
C.qualities to make
D.do the qualities that make

Not only.................my keys, I've lost my wallet, too.
A.I have lost
B.are I lost
C.did I lose
D.have I lost

Rarely..................about the environment enough to give up their car.
A.do people care
B.people care
C.are people care
D.care people

Only when.............may vehicles cross the train tracks.
A.is the green light on
B.the green light is on
C.did the green light be on
D.on is the green light

Only after doing his chores ...........to go to meet his friends.
A.Jasson was allowed
B.did Jason allow
C.was allowed Jason
D.was Jason allowed

Under no circumstances ..................without supervision.
A.do the equipment to be used
B.did the equipment to be used
C.is the equipment to be used
D.were the equipment to be used

- "I wish I had some money"

- "............."
A.So did I
B.So do I
C.So have I
D.So am I

Chọn câu đúng
A.I did learn the result of the match until I read the evening paper.
B.Only when I read the evening paper did I learn the result of the match.
C.Only when did I read the evening paper did I learn the result of the match.
D.Not until did I learn the result of the match that I read the evening newspaper.