Choose the correct answer

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1. Teenagers need encouragement from their parents, ______ are willing to encourage their children.
A. for
B. and
C. or
D. however

2. Many girls worry about ______ themselves in a mirror.
A. so
B. but
C. for
D. therefore

3. Social media helps teens connect with others; ______ they also cause teens to feel lonely.
A. so
B. yet
C. or
D. although

4. They spend a lot of time surfing the net; ______ they have little time to read books.
A. however
B. therefore
C. otherwise
D. for