3.At least three military a_____________________(飞机)were destroyed in the fight.

1.Those who will attend the meeting have different n_______________(国籍).

2 Every a__________________ must fill in the application form from now on.

25.It will not be ________ we can meet again.

　 A. long before　　　　 B. before long　　　 C. soon after　　　　 D. shortly after

24. Every possible means _______to prevent the air pollution, but the sky is still not clear.

A. are being used　 B. have been used　　　 C. has been used　　　 D. had been used