11. Though__________money,his parents managed to send him to university.

　　[A]lacked

　　[B]lack of

　　[C]lacking

　　[D]lacked in

　　12. Something must be done. There will not be enough space even to stand __________ the earth.

　　[A]in

　　[B]on

　　[C]in on

　　[D]on in

　　13. --"Cars and buses burn oil. "

　　--__________

　　[A]So do many other machines

　　[B]Many other machines do so

　　[C]So many other machines do

　　[D]Many other machines so do

　　14. John and Sue __ computer games for hours before their parents came home from work

　　[A]are playing

　　[B]have been playing

　　[C]played

　　[D]had been playing

　　15. -- Would you mind holding the door open for me, please?

　　--__________.

　　[A]Don’t mention it

　　[B]Oh, with pleasure

　　[C]Well, that’s all right

　　[D]Thank you all the same