His wife has left him, but he behaved _______ nothing had happened.

____________ is that red dress—It’s fifty yuan.

When you keep goldfish, it is a good idea to put some stones at the of the tank(鱼缸).—So the fish can hide behind them.

FM 97.4 is the best .It plays popular music every day.

We, teenagers, have already had the ability to take care of our daily life __________.