Most students find _____ hard to learn maths well.
This is the hotel ________ last month.
What________ the public was that Phelps should take drugs.
The Red Army soldiers had to fight________ all kinds of difficulties in their fight________ the people’s freedom.
Some people fear that ________ air pollution may bring about changes in ________ weather around the world.
Only when I left my parents for Italy________ how much I loved them.