练习题
    
    1. My bike is missing. I can’t find ____ anywhere.
    
    A. oneB. onesC. itD. that
    
    2. ---- Who’s that?---- ____ Professor Li.
    
    A. That’sB. It’sC. He’sD. This’s
    
    3. ---- Have you ever seen a whale alive?---- Yes, I’ve seen ____.
    
    A. that B. itC. suchD. one
    
    4. The color of my coat is different from ____ of yours.
    
    A. thisB. thatC. itD. one
    
    5. ____ will do you good to do some exercise every morning.
    
    A. ItB. ThereC. ThoseD. You
    
    6. We think ____ our duty to pay taxes to our government.
    
    A. thatB. thisC. itsD. it
    
    7. The climate of Shanghai is better than ____ of Nanjing.
    
    A. thatB. itC. whichD. what
    
    8. ____ four years since I joined the Army.
    
    A. There wasB. There isC. It wasD. It has been
    
    9. How long ____ to finish the work?
    
    A. you’ll takeB. you’ll take itC. will it take youD. will take you
    
    10. Mary speaks in a low voice; ____ is difficult to know what she is saying.
    
    A. itB. thatC. soD. she
    
    11. So ____ that no fish can live in it.
    
    A. shallow is the lake B. the lake is shallow
    
    C. shallow the lake is D. is the lake shallow
    
    KEY:
    
    1-5 CBDBA 6-11 DADCA