Though he started late,Mr.Guo played the piano as well as,if______,Miss Liu.

You must be surprised andexcited to see the film star here.— You’re right_____.[ ]

f modern agriculture, more and morewaste is produced

our father returned from Europe yet—Yes, but he ______ here for only three days beforehis company sent him to America.

If our government ______ attention to controlling food safety now, our health ______ in danger.