I will tell you a secret, but you must promise it around.
I don’t know if it _______ tomorrow. If it _____, we will go out for a picnic.
An old man was found ______ in his house. Luckily, he was taken to hospital in time.
The old scientist devoted most of his time __________ the space science.
—Excuse me, Mum. When can we have dinner? —Not until it in half an hour.
— Do you know whose magazine is it? — I think itbe Lily’s, for we can find her name on the cover.