When it is your turn to talk, what I wantto tell you is ______you can show respect by making sure the listenerunderstands ______ you are saying and is interested.

下列各句中，没有语病的一句是

Where is Bob? I cannot find him anywhere.— He ________ have been off long. I heard him make a call just now.[ ]

is good for your .

After running a 1000-metre race, he was________.