He swam in the river this summer. ________A. So did he. B. So she did. C. So did she
—How many birds can you see in the trees? —I can see _________ birds in them.
—Where is Miss Wang? —She went to Hainan Island last week and will return _______ six days.
There will be _________ pollution this year than last year.
—Will people live to be 300 years old? —_________.
There ______ an art show this Sunday.