________such heavy pollution already, it may now be too late to clean up the river.
| A．Having suffered |
| B．Suffering |
| C．To suffer |
| D．Suffered |
—What about ______ lecture you attended yesterday?
—To tell the truth, it was too boring. I can’t stand ______ lecture like that.
| A．a; the | B．the; a | C．the; / | D．the; the |
—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 |
______difficulties we may come across, we' ll help one another to overcome them.
| A．However | B．Wherever | C．Whenever | D．Whatever |