________ that I was a regular visitor, the servant let me in.
| A．Having seen | B．Seen | C．Seeing | D．To see |
It is no use fishing for golden fish in this river; there are _____ left.
| A．some | B．none | C．a few | D．many |
Writing has _____ much of my spare time, but it has given me a great deal of pleasure.
| A．taken off | B．taken down | C．taken away | D．taken up |
_____ is no possibility that Bob can win the first prize in the match.
| A．There | B．It | C．That | D．This |
—Have you ever ridden a horse ?
—No, but I _____ a camel when I visited Egypt last year.
| A．was riding | B．have ridden | C．rode | D．had ridden |
It took a great deal of courage to admit that all his efforts had been ____.
| A．in vain | B．in turn | C．in return | D．in danger |