—Do you have ________ difficulty working out the problem?—Yes. It is ________ me.
By the end of last week, we __________ a satisfactory solution to the problem.
A large sum of money has been raised the poorly-educated children in the mountainous areas.
I shall never forget those years ________ I lived on the farm _______ you visited last week.
.Although it had been______ struggle for him to finish the experiment, he enjoyed the result with________ satisfaction.
― Did you go to the 2010 Shanghai World Expo? ― Yes, my father took me there. It was really __________!