So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard.

Peter，is there anything else you want to know about China?—Yes，I am still wondering __________ .

After a short time, the bad news had ______all over the city and everybody knew it．

Congratulations! Among the best pictures in the competition, I found _________. When did you draw it?—During the trip to the Yellow Mountain _________ May.

I feel __________ cold and I think I should have __________ hot water.