The weather was ______ cold that I didn’t like to leave my room [ ]

equired that the students______ mobile phones intheir school, so seldom ______ them using one

The reason why they failed the test was ____ they didn’t sleep at all the night before.

_______ difficulty we meet with, we must finish it on time, because the opportunity is_______ valuable．

Mum, do you mind my to music for a while—Of course not. But please to it with your earphone.