1. When you see this letter, we have just made a difficult decision. Before Qihoo360 stops infringing upon and slandering QQ, we have decided to stop running QQ on computers installed with 360's software.

2. In an effort to protect the validity of GRE scores, ETS has made the difficult decision to cancel all scores resulting from the Oct.23, 2010 GRE administration in China.

3. I've decided to quit my job, this is really a tough decision.

4. The city council has to make the tough call and decide whether to cut education or tourism budgets.

5. We've had a hard time making this decision, sorry, you are fired.

6. TV fans may have tough choices in new season.