After two hours of walking, they came to the camp site, ______ .
The demand that the law on gun ownership _____ be changed ___ is very strong.
The increase of the number of the students makes the limited computers not ________ to each student.
He had just sent an email to his pal on the Internet ________ the system broke down.
While intelligent people can often ______ the complex, a fool is more likely to complicate the simple.
People develop ________ preference for a particular style of learning at ________ early age and these preferences affect learning.