The weather is ____ and ____.People are ____hats and sweaters.

某城市按以下规定收取用户每月的煤气费：某用户用气如果不超过60m³，按每立方米0.8元收费；如果超过60m³，超过部分按每立方米1.2元收费；已知某用户4月份煤气费平均每立方米0.96元，那么，4月份这位用户应交煤气费____ 元．

It was not until dark ___ he was aware of ___ he thought was the correct way to solve the problem.

下列描述天气的是（      ）