299. Heal(治愈) ____ , rescue ____, practise humanitarianism(人道主义) is the sacred duty of all the doctors and nurses.
______ you talk or write a message to someone, you show your language skills to others.
As we all know, a proper amount of exercise _______ to good health.
——Do you know who left the computer on all night long? ——It seems that Tom is_______. He played computer games yesterday afternoon
An interesting suggestion on how to measure the temperature on the moon has been______.
The manager has _____ difficulty in finding a man to take _______place of the secretary