93．The police found a　　　　 (线索)which will help them catch the robber.

92．You should learn to　　　　　 (适应)to your new life.

91．He, who is making a speech now, r　　　　　 China in the conference.

90．You should give a brief　　　　 (介绍)to all the people present.

89．It is good m　　　　 to wait in line when buying tickets.

88．Polluted water and air are h　　　　 to our health.

87．Words and i　　　　　 are being sent throughout the world.

86．More and more e　　 are included in today’s Olympic Games, such as table tennis, badminton and boxing.

85．In 1776 America became an ______ country. After that, the ______ slowly began to change.

84．The knife and fork that are ______ to your plate are a little bit bigger than the ones beside them.