Nuclear radiation is said __________ the biggest health challenge in Japanese Earthquake over the past few months.
The situation is getting worse. We must __________ the trouble _____________.
___________ was no doubt __________ someone had broken into the store the day before.
You __________ have told him my comment on him. Now, he is very angry with me.
--- I wonder if I could use your camera this afternoon. --- ________________. I’m not using it recently.
— I’m afraid what I did cannot satisfy your requirements. — _____. At least you tried.