Mother had a hard time getting Helen up in the morning. She called and called, but Helen wake up.( )
A.wouldn'tB.mustn'tC.needn'tD.shouldn't
Be quick, we’ll be late for the meeting.
I still remember my first teacher __________ we haven’t seen each other for many years.
They have been friends __________ they were at primary school.
I’ll go to visit my uncle in England ________ the winter holidays start.
The mobile phone has changed people’s life a lot ________ it was invented.