—She looks very happy. She ____have passed the exam.
—I guess so. It’s not difficult after all.
| A．should | B．could | C．might | D．must |
Our efforts resulted________failure.I think I’m also responsible________it.
| A．in；to | B．from；to | C．in；for | D．from；for |
When was it________you let out the secret?
| A．which | B．what | C．that | D．why |
-- Have you seen ______pen? I left it here this morning
-- Is it ______black one? I think I saw it somewhere
| A．a；the | B．the；the | C．a；a | D．the；a |
Great changes ______ in the past few years, and a lot of factories ________.
| A．had taken place; have been set up | B．have taken place; have been set up |
| C．took place; have set up | D．were taken place; were set up |
—What about going for a walk?
—______.
| A．Go ahead, please | B．Me, too | C．Help yourself | D．Good idea |