In those days, books could only be produced one at a time by hand. __________, they were expensive and rare.
—What do you think of the house? —It is much more beautiful than________. A.we B.us C.ours
China plans to let tourists________the Xisha Islands in the South China Sea this year.
—________do they go to the park? —Because they want to play games there.
—Let’s go to the zoo on Sunday morning. —________.
The________often cat grass on the hill.