The experiment shows that proper amounts of exercise, if _______ regularly, can improve our health.
.______is known to us all is that the 2008 Olympic Games took place in Beijing.
.Don’t try to cheat the taxman(税务人员); you’ll never ______it.
.He has behaved in the most extraordinary way recently, I wonder what can _______his actions.
.We won’t give up _____ we should fail ten times.
.---May I go with my friends to the harvest festival ? --- _______