She started studying medicine at college, but_______to Business Studies in her second year.

To show our respect,we usually have to take our gloves off_____we are to shake hands with.[ ]

_____ORBIS doctor who got here yesterday needed_______ X-ray machine to examine his patients.

Whatare you going to do this weekend–________．If time permits, I may go to Shanghai with my friends．

I think math is ____________than English.