The repair work may take us a long time，but          it’s worth trying.

If you smoke a cigarette every day, you will _____ become addicted to smoking．

Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock?  

—Do you often visit your friends?—________，because we are all busy with our jobs.

I can’t finish this job by Friday. You expect too much of me.