Anyone can borrow books from this library _______ he keeps them clean and returns them in time.
Our government has taken some measures to overcome the lack of electricity, but it may take some time________ we have enough power.
Science and technology are advancing so quickly that________ is a possibility today may be a reality tomorrow.
Each person has his / her unique character which ________him / her from others.
That is the only way we can imagine________ the overuse of water in students’ bathrooms.
.—You didn’t take the high-speed train with the leading letter "G" to Shanghai? —________. I still took the "D" train, which saved me more than 50 yuan.