—Be careful! A car could have hit you!
— Thank you! I ________ I ________ so close to the road.
A.didn't know; was standing B.didn't know; am standing C.don't know; should stand
The teacher raised his voice so that he could make himself ________.
A.heard B.to hear C.hear
In our city, one third of the area________covered with green trees, but only forty percent of them ________ well looked after.
A.is; have B.is; are C.has; are
—Have you finished your project yet?
—Not yet, but I ________ it in half an hour.
A.will finish B.have finished C.could have finished
A human brain can do some things, such as creating new ideas, ________ than a computer.
A.worse B.better C.later
—Oh, I lost my chance again.
—Don't lose heart. One more effort ________, you will succeed.
A.so that B.and C.therefore
