下列小写字母都占三格的是______。
He ____ ever ______ (be) to the History Museum several times.
–____ delicious food! –Yes, and __ nice it looks!
–Can you teach __ English? –Sorry, I can’t, but I can teach you__ swim.
I can’t believe __ a little girl can carry ___ many books.
Our school will organize ___ summer camp.