--- Why do you want the book?
---- _________, sir.
| A．Studying | B．Studies | C．To study | D．Studied |
— You ought to have called her yesterday . — Yes , I know I ____ .
| A．ought to | B．ought to have | C．ought have done | D．ought to have called |
________, the gathering crowd burst into applause.
| A．On entering the hall | B．When he took the floor |
| C．The speaker took his place | D．No sooner had the speaker entered |
AIDS is spreading all over the world at shocking speed. Where its dark _______ appears, we see pain, tears and death.
| A．shape | B．shadow | C．ambition | D．feeling |
--Listen! Someone is knocking at the door.
-- ______ be Mary. She has just been to Beijing
| A．She mustn’t | B．It can’t | C．It must | D．She may |
The Shengzhou VI aircraft carried two astronauts into____sky at 9:00 am on October 12, 2005 and the two astronauts will stay in _____space for five days.
| A．a; the | B．the; 不填 | C．the; the | D．a; 不填 |