单项选择题
The movement of the moon conveniently provided the unit of month, which was ______ from one new moon to the next.
单项选择题 Could you tell me ______ in the Russian alphabet
单项选择题 Contrary ______ public opinion, this area has long been a heaven for all forms of insect life.
单项选择题 Your advice would be ______ valuable to him, who is now at a loss to what to do first.
