Do you know our city at all? — No, this is the first time I ________ here.

I’m writing this letter ________ mymother, who wants to thank you for your nice gift.

It’s dangerous to swim in this river. .–Yes, you are right. The government has people not to swim in it.

What a pity! I missed meeting my boss at the airport because my car was ____in the traffic jam.

I don’t mind telling you what I know. — You _________ . I am not asking you for it.