51.As a good friend，you can turn to her for help when you are in the trouble.

50.The guy did all that just as we had expected him to.

The guy did all that just_______ _______.

49.We can only settle this problem by this means.

Only by this means_______ _______settle this problem.

48.That accident happened around 3:00 this morning.

That accident happened_______ _______3:00 this morning.

47.Thousands of young men have applied for the voluntary job.

Thousands of young men have_______ _______for the voluntary job.

46.It seems that they have known everything about this event.

_______seem_______have known everything about this event.

45.The news of the WTC being destroyed_______(震惊)the whole world.

44.With economics developing fast，China_______(应当得到)greater admiration.

43.In the_______(大气层)，there exists an element called nitrogen(氮).

42.The corporation has business_______(机构)all over the country.