Although he has failed many times, he keeps _____ hard to make his dream come true.
A. working
B. to work
C. worked
The person ______ called yesterday wanted to buy the house.
A. which B. who C. whom
In spring, a lot of young trees _______ in our city.
A. are planted
B. plant
C. has been planted
—Could you please tell me _______the park as soon as possible?
—By bus, I think.
A. how can I get to
B. how I can get to
C. when I can get to
______ he was exercising at the park yesterday morning, he found a purse under the tree.
A. While B. Before C. Though
I hear that another big library ______ in their school two years ago.
A. will be built B. is building C. was built
