Tom took a taxi to the airport, only ________ his plane high up in the sky.
Don't make any noise. Her mother _______ by a doctor.
-Do you know what Lily is doing?-She _______ in the office.
-Hi, Terry, can I use your computer for a while this afternoon?-Sorry. _______.
My sister wants to work in that tall building which ______still _______.
-Why do you come to work on foot today?-Well, my bike _______ and I hate taking a crowded bus.