Columbus _______ the new world many years ago.
A. found B. looked for C. discovered D. find out
Practicing conversations ________ able to help you improve your speaking skills.
A. can B. are C. is D. will
Your dream won’t come true_____ you know what your dream is.
A. after B. because C. unless D. though
It’s hard _______ us ____ finish the work before five o’clock.
A. for ; to B. for; of C. of; to D. to, of
I reall y don't know ______ this question.
A. which to do B. which to answer C. what to do D. how to answer
—We can’t be successful ________ we keep working hard.
—I agree with you.
A. if B. unlessC. because D. when
