52. The struggle against sand storm will not end _____ victory unless we pay much attention to the balance of nature.
by the growing interest in nature, more and more people enjoy outdoor sports.
The best reporters have been sent to South Africa to ______ the 2010 World Cup, so we can get informed of the situation there very quickly.
Listen! Do you hear someonefor help?
______ most of us considered solving the problem as soon as possible, he considered it of no importance.
I stayed there for only two days but ______ felt like two weeks.