Information technology is taught in most schools, ________ we have entered the information society

Who helped you fix your bike-_______! I fixed it all by myself.

Many developingcountries are unwilling to pursue their economic development ______ destroyingthe environment despite there being several financial crises.

She has been ________ over his strange letter for several weeks, but she still figures out nothing about it.[ ]

The weather in Harbin is colder than ____in Gang Dong.