People can find so many good things, such as useful information and lovely pictures on the web, __________ it is also a global village filled with bad things.
This church is as old as, if _____ than, that one.
Her pronunciation is as good as, if ____than, her teacher's.
In that month, he earned as much as, if ____ than, $40 000.
The research is so designed that once _____ nothing can be done to change it.
If _____ carefully, the experiment will be successful.