It is only 6.7% of Korean students _____ have ever read Chinese books or watch Chinese TV programs.
George is going to talk about the geography of his country, but I'd rather he ________ more on its culture.
Don't handle the vase as if it ________ made of steel.
Jack is a great talker. It's high time that he ________ something instead of just talking.
—Where are the children? The dinner's going to be completely ruined. —I wish they______always late.
Eye doctors recommend that a child's first eye exam ________ at the age of six months old.