-Hello, _______ I speak to Lily? -Hold on, please.

It has been announced that students _______ remain in their seats until all the papers have been collected.

— Wow! You look different! You            wear glasses.— Yes, I did. But now I am wearing contact lenses(隐形眼镜).

(2013·北京东城二次联考)—________ you interrupt now？Can't you see I'm on the phone?—Sorry，sir，but it's urgent.

We can hardly believe such a young boy ______ travel around the world all by himself.