20．-Poor Steve! I could hardly recognize him just now!　

　　　 -________．He has changed so much．　

　 A．Never mind 　　　　 B．No problem 　　　　 C．Not at all　 　　　　　 D．Me neither

19．I just don’t understand _______ that leads to so many teenagers becoming addicted to playing computer games．

　 A．why it does 　　　　 B．what it does 　　　 C．what it is　 　　　　 D．why it is

18．Amy joined a painting group but didn’t seem to _______, so she left．　

　 　 A．show off 　　　　　 B．go up 　　　　　　　　 C．fit in 　　　　　　　　　 D．come over　

17．-Did you enjoy yourself last night?

　　　 -Yes, it’s very nice of you．I appreciated ________ to the party．

　 　　 A．to be invited 　　　　　　　　　　　　　　　　　　　 B．to have invited

　 　　 C．having been invited　 　　　　　　　　　　　　　 D．having invited

16．Nowadays, teachers tend to be more dependent on _______ is thought to be a great teaching aid the computer．

　 　　 A．that 　　　　　　　　　 B．which　 　　　　　　　 C．what 　　　　　　　　 D．as

15．Whenever I met her, _________ was fairly often, she greeted me with a sweet smile．

　 　 A．who 　　　　　　　　 B．which 　　　　　　　　 C．when 　　　　　　　　 D．that