There are stars in the Galaxy. We can’t count them.
A. billion of B. billions
C. billions of D. Billion
—What do you think of the four classics (名著) of China?
—They are wonderful, but I’ve read of them.
A. both B. none C. neither D. All
Thank you ________ your timely help.
A. to B. with C. for D. in
I haven’t ________ from my pen friend for a long time.
A. heard a letter B. hear a letter C. heard D. hear
.My parents ______________ America for 50 years.
A. have been in B. have been to C. have gone to D. have been
---Have you finished you work ____________?
--- Yes, I have. I’ve ____________ finished it.
A. already; yet B. yet; already
C. just; already D. just, yet
