— Pity you missed the lecture on nuclear pollution —I _______ it, but I was busy preparing for a job interview.

—— I can’t get through to the general manager’s office anyhow. —— The line is busy. Someone＿＿＿＿＿the telephone. 

It is often recommended that children _______ chances to get close to nature.

— Please don''t make a noise .  — ____ . I''ll be as quiet as a mouse . 

 I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.