It is ________ to say“thank you” very often, even to family members.
句意：经常说“谢谢”是礼貌的表现，即使是对家人。
考查形容词辨析。polite礼貌的；rude粗鲁的；dangerous危险的；humorous幽默的。根据“thank you”可知，说“谢谢”是礼貌的，故选A。
It is ________ to say“thank you” very often, even to family members.
No one is ________. Thekey is to learn from mistakes and never stop.
—I always feel ________when speaking in front of others.
—Take it easy and be brave.
Our teacher often warnsus it’s ______ to leave much personal information on the Internet.
—Can I keep the book alittle ___________? I haven't finished reading it yet.
—Sorry. You have to return it on time.
What a________ boy! Heworked out such a difficult math problem.
Last year, three hundredEnglish teachers took part in the _______ English Training.
The little girl wrotea________diary last night.
Jenny’s parents werecompletely__________ when they saw the_______ changes in her.
—Why are you so happy,Mr. Wang?
—Because the movie yesterdayevening was so _______ and it made me ________.
