—What's the matter with Philips?
—Something must have happened to him. He left home three hours ago, but ________ at the party!
A．didn't arrive B．isn't arriving
C．hadn't arrived D．hasn't arrived
If this product does not give you complete satisfaction, please return it to the manufacturer, stating when it ________.
A．is purchased B．will be purchased
C．purchases D．has purchased
—David, are you listening to me?
—Sorry, Dad. I ________ to make sense of what the reporter said.
A．was trying B．have tried
C．am trying D．tried
—Look! Someone ________ the floor.
—Well, it wasn't me. I went shopping just now.
A．had swept B．has swept
C．was sweeping D．is sweeping
It's said that they ________ a better life ever since they moved to the US.
A．had enjoyed B．have been enjoying
C．were enjoying D．would enjoy
—Ouch! You hurt me.
—I'm sorry. But I ________ any harm. I ________ to drive a rat out.
A．don't mean; am trying
B．didn't mean; tried
C．haven't meant; tried
D．didn't mean; was trying
