49. He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____.
| A．on duty; off duty; on night duty | B．on his duty; off the duty; on night duty |
| C．to duty; from duty; at night duty | D．in duty; out duty; at night duty |
______ the windows ______ the pictures of different styles.
| A．Among; hang | B．Between; hanged | C．Among; hanging | D．Between; hang |
________ several years he has been working like this.
| A．In | B．After | C．For | D．Since |
– Are you married?
--No, still______.
| A．one | B．single | C．separate | D．myself. |
_________ surprise you have brought us!
| A．What a | B．What | C．How a | D．How |
Finally they managed to find a path _______.
| A．to follow | B．following | C．to go | D．going |