May be if I ______ science, and not literature then, I would be able to give your more help.
She still remembers Beijing University, ____________she graduated five years ago.
_______ from what he did, he isn’t a person to depend on..
The students left the room _______all the lights on.
Roses need special care ______they can live through winter.
Only in this way ____to make an improvement in the operating system.