Research shows that humans ______ from selfish to unselfish behavior when they are watched.
| A．tell | B．switch | C．range | D．distinguish |
—Have you __________ ?
—No. I had the wrong number.
| A．got in | B．got away | C．got off | D．got through |
Ladies and gentlemen, please remain __________ until the plane has come to a complete stop.
| A．seated | B．seating | C．to seat | D．seat |
I like this house with a beautiful garden in front , but I don’t have enough money to buy__________.
| A．one | B．it | C．this | D．that |
He told us whether _________ a picnic was still under discussion
| A．to have | B．having | C．have | D．had |
1. —May I open the window to let in some fresh air ?
—___________
| A．Come on | B．Take care | C．Go ahead! | D．Hold on! |