This morning, when I walked by, I saw many children ____ in the park.

The girl spends at least as much time singing as she __________.

--- I’d like to borrow a book. Its name is “Travel around the world”. --- Let me check on the computer first. Oh, it ______ that Kate has got it.

—What a clean and bright classroom, isn’t it?—Yes, it’s always clean and bright because it       every day.

–Have you ever _______ to Singapore?–No, never.