No one should blind himself （） the well-known fact.

单项选择题I thought you might be tired, （） is why I decided to help you.

单项选择题All of them are （） at Lana s achievement.

单项选择题No agreement was （） in the discussion as neither side would give way to the other.

单项选择题What effect has the Internet had on music piracy

单项选择题The author s attitude towards gift giving is （）.