I tried several ways to work out the math problem, but of them worked.
Never give up. I believe you'll make it.( )
A.allB.eachC.noneD.neither
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.