—The water was running all night long.
—Yes. It seemed that John ______ . He was the last one to leave the lab.
| A．was to be blamed | B．was to blame |
| C．had been blamed | D．should be blamed |
—Why does Mary look so worried today?
—I’m not sure, but she _____ a small accident driving here.
| A．must have | B．might have | C．must have had | D．might have had |
Tom asked the candy makers if they could make the chocolate easier ____ into small pieces.
| A．broken | B．to break | C．break | D．breaking |
The girl in the photo was smiling sweetly, _____.
| A．her long hair flowed in the breeze |
| B．her long hair was flowing in the breeze |
| C．her long hair flow in the breeze |
| D．her long hair flowing in the breeze |
—Welcome to my home! But why didn’t you pay a visit to me last time?
— I would have, but I _____ your address.
| A．have forgotten | B．would have lost | C．forgot | D．had lost |
When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
| A．that | B．which | C．where | D．when |