The winner of the race is tall and thin; he ___be my friend, Mike, who is short and fat.
| A．might | B．mustn't | C．can't | D．should |
It was foolish of you to take a taxi ___ you could easily walk there in five minutes.
| A．while | B．when | C．since | D．before |
He is only too ready to help others, seldom, ____ refusing them when they turn to him.
| A．if never | B．if ever | C．if not | D．if no |
The traditional approach ____ with complex problems is to break them down into smaller, more easily managed problems.
| A．to dealing | B．in dealing | C．dealing | D．to deal |
Someone called me up in the middle of the night, but he hung up ____ I could answer the phone.
| A．as | B．since | C．before | D．until |
------ What made little Tony so unhappy and cry in his room?
------- _________to go biking with his brother.
| A．Having not been allowed | B．Not having allowed |
| C．Having not allowed | D．Not having been allowed. |