Sir, please put out your cigarette (香烟). — Sorry. I the sign.

We must act now because time is _______.—Yes. Let’s start.

_______ you like to go shopping with us —Yes, I _______.

Sally took a photo of her friends while they _________ computer games.

Reportedly, yesterday a group of American soldiers were walking along the road in Iraq when a bomb was _______, three of whom were killed．