21.I found the very watch of mine _____ I had left _____ . A. where;it B.that;it C.which;one D.where;one 22.--How can I repair it? --Well, look at the _____? A.explanations...

One summer evening Simon was sitting by the window, reading a good but rather 21 mystery story. After a time it became 22 dark for him to read, so he put his book down and got up to turn on the light...

21．A good idea occurred to Mr Baker ______to his invention recently. A．while applying B．while applied C．while he was applying himself D． while applying himself 22．I have _____ my...