He didn’t know what kind of a career he wanted ______ he decided to do volunteer work in Africa for a year to gain experience of the world.
A.when
B.while
C.because
D.so

Fishing for certain species of fish is often seasonal, _______ many modern fishing boats are designed to operate using two or more different fishing methods.
A.whereas
B.although
C.however
D.so

I preferred the green and white shoes ______ they’re cheaper than the ones that you just showed me.
A.despite
B.while
C.thus
D.since

The philosopher Thomas Hobbes believed man was nasty and violent, ______ the philosopher John Locke saw him as rational and reasonable
A.by the time
B.whereas
C.moreover
D.although

Today, Sparta is an insignificant city, ______ it was once the capital of one of the most important city-states in the Greek world.
A.despite
B.since
C.so
D.yet

A/an ______ is a person who needs others to take care of him/her, because of illness that he/she had for a long time.
A.patient
B.invalid
C.martyr
D.addict

Mr. Chen is more ______ because he has finally agreed to allow his daughter to join an overseas volunteer organisation in Africa.
A.open- minded
B.narrow- minded
C.single- minded
D.absent- minded

We have to employ a few more workers, ______ we won’t be able to get the order ready by the arranged date.
A.until
B.or else
C.even if
D.unless

It’s usually quite simple to cross the border between the USA and Canada ______ these two countries have friendly relations
A.yet
B.regardless
C.because
D.and

She hasn’t had much time to socialize ______ she took a part-time job besides her school studies.
A.when
B.since
C.though
D.unless