After the final exam, I think all the students want _________.
The new system needs to be in operation for five months ________ it can be updated.
We can't wait any longer ________ we'll miss the plane.
House prices vary from place to place and are usually high ________ there are famous schools.
It will be another 50 years ______ our country is expected to reach the level of a medium developed country.
Jerry has promised to keep the secret, so he won't tell anyone ________ asked to.