_____ the woman entered the office, Tom’s eyes lit up.

 Our bodies are strengthened by taking exercise.  ________，our minds are developed by learning. 

. John hadn’t been able to quit smoking at once; he had to control his smoking desire      .

The earth could be younger and took more than three times longer to form than _______ thought, according to a new study.

 The cousins are alike in age，but ________ they are as different as day and night.