Visiting _______ Great Wall is ________ unforgettable experience to me.
| A．/; / | B．/; an | C．the; an | D．the; / |
Which do you enjoy ____ your weekend, swimming or fishing?
| A．spending | B．being spent |
| C．spend | D．to spend |
I think this is the very work that we must finish ____ her.
| A．to help | B．help |
| C．helping | D．helped |
The work he devoted his time to _____ worth praising.
| A．was | B．be |
| C．being | D．been |
The theory he sticks to ______ to be of no use in our studies.
| A．proves | B．prove |
| C．proving | D．be proved |
The man you referred to _____ just now.
| A．comes | B．come |
| C．coming | D．came |