. Meeting my uncle after all these years was an unforgettable moment, ________ I will always treasure.
| A．that | B．one | C．on which | D．what |
Is the museum ___ we visited last year?
| A．the one | B．where | C．which | D．that |
She needs the work ____ before tomorrow.
| A．done | B．be done | C．doing | D．be doing |
--Did a letter come for me?
--Yes, ___ came for you this morning.
| A．that | B．it | C．one | D．the letter |
He is determined to devote himself to ___ the country.
| A．serve for | B．serve | C．serving for | D．serving |
Whenever we were ___, he is always ready to ___ us some help.
| A．in the trouble; give | B．in trouble; offer | C．in a trouble; pay | D．in trouble,take |