With a lot of problems , the VS troops are having a hard time in Iraq.
The country has _______ great changes and become a developed one.
We are often _____ by the doctors to eat more healthy food and take plenty of physical exercise.
We asked the teacher to explain _______.
—Did you see a man in black pass by just now?—No, sir. I ______ a newspaper.
Only by working hard can you ______ the goal.