A．introduceB．showC．directD．explain

【C14】A．manageB．tryC．directD．tend

【C3】A．introduceB．introducedC．introducingD．being introduced

【C7】A．safeB．goodC．directD．worthy

【C6】A．showingB．will showC．showsD．to show

【C2】A．contactB．showC．exposureD．breath

【B16】A．exhibitsB．showC．revealsD．talk