1 These scientists have made great c------ to sending up the satellites into outer space.

题目

1 These scientists have made great c------ to sending up the satellites into outer space.
2 A large number of mouths must be fed in those less d----- countries.
3 That evening Beethoven played the music for the girl as well as u-----.
4 I phoned her s-----times,but i couldn't reach her

答案

1.These scientists have made great (contribution) to sending up the satellites into outer space.2.A large number of mouths must be fed in those less (developed) countries.3.That evening Beethoven play...