________ seems to be a strong competition in China for senior high students to enter college or university.
Making a proper choice ______ the future will probably make much difference in our life.
In Canada, cross country skiing is a popular sport among people ______ they can enjoy excitement and adventure.
According to what he complained about, something must have gone wrong with the computer, ______?
an important position in a big company, Richard has a good chance to improve himself.
It worries the couple a lot ______ their only son is behaving worse and worse these days.