The problem was so __________ that such a little boy can't solve it.
| A．funny |
| B．interesting |
| C．complete |
| D．complex |
. —She ’s failed her test again.
—________. She has been studying very hard.
| A．I don’t think so | B．Don’t worry | C．Why not ? | D．What a shame |
---When did you see the bird last night?
---It was at about ten thirty ______ I got home.
| A．before | B．when | C．that | D．until |
—I’m afraid I can’t afford a ticket to the concert, so I won’t be able to go with you.
—Don’t worry. It’s my ________.
| A．pleasure | B．treat | C．business | D．invitation |
—Hi, Li Xiaoxia. What a surprise! Dad _____ you _______ so early. He’s upstairs reading. I’ll just call him.
| A．didn’t know; would come | B．doesn’t know; are coming |
| C．hadn’t known; were coming | D．hasn’t known; will come |
—Where is Lu Wenjie? 
—I have no idea．He__________ be in the library.
| A．can | B．must | C．might | D．shall |