pity! Considering his ability and experience,he ______ better.

1_________ gets tired afterthe tennis training.

Doctor Nathan is said to have been ________to researching into wild animals inAfrica for more than ten years.

_____ and short of breath, Andy and Ruby were the first to reach the top of Mount Tai. [ ]

The doctor must have sat up all night with his patient, __ you see, he looks tired and sleepy