_________many times, he finally understood it.
| A．Told | B．Telling |
| C．Having been told | D．Having told |
______how others react to the book you have just read creates an added pleasure.
| A．Hearing | B．Hear | C．Having heard | D．To be hearing |
If we leave right away,____ we’ll arrive on time.
| A．hopefully | B．curiously | C．occasionally | D．gradually |
The children,____ had played the whole day long, were worn out.
| A．all of what | B．all of which | C．all of them | D．all of whom |
As the world’s population continues to grow, the ___of food becomes more and more of a concern.
| A．worth | B．supply | C．package | D．list |
Imyself more－it was a perfect day.
| A． | shouldn't have enjoyed | B． | needn't have enjoyed |
| C． | wouldn't have enjoyed | D． | couldn't have enjoyed |