When did you start to listen to pop music?

=> How long _____________________?

Tom and Mary have worked in that factory since 1990.

=> Tom and Mary began _______________.

C. of

They don't pay Jack very much 

-> Jack __________________.

She doesn't get up late anymore.

=> She used _________________________.

She couldn't come to class because of her illness.

=> Since _______________.

I don't intend to apologize to either of them.

=> I have no _____________________.

D. appearance.

It takes three hours to drive from Hai Phong to Ha Noi. 

=> It is a _________________.

They have learnt English for ten years.

=> They started _______________________.