4.It is said that the early European playing-cards ____ for entertainment and education.
__________ the Internet is bridging the distance between people, it may also be breaking some homes or will cause other family problems.
—I don't know what I should have done without your help.— __________.
A major issue was put forward by some representatives at the conference __________ the teachers in the remote areas were underpaid.
I have little doubt __________ the plan will succeed.
__________ many benefits, cell phones have brought for their owners a number of new headaches.