I bought a vase of the Ming dynasty at such a low price at the Sunday market. It was really a nice __________.
Is the museum ___ we visited last year?
She needs the work ____ before tomorrow.
--Did a letter come for me? --Yes, ___ came for you this morning.
He is determined to devote himself to ___ the country.
Whenever we were ___, he is always ready to ___ us some help.