-----Are you happy with your new computer?----- No, it is _______ me a lot of trouble.
The two brothers look much the same , but they have nothing ________.
The farm _______once we worked has changed a lot.
I have no doubt ______ she will come out first in the English contest.
Her teacher helped her so much that she bought him a beautiful pen _________.
His disappearance(失踪)______ by the police.