—Has Sam finished his homework today?—I have no idea. He ________ it this morning.
One's life has value _______ one brings value to the life of others. (2012 .江苏)
April Fools' Day is a day to play jokes on others, but no one knows when such a custom first ______.
I appreciated ______ the opportunity to study abroad two years ago.
The Johnsons have moved to a different house ______ their children can attend a better school.
-What's the time now? - ______ my watch, it is 4-o'clock.