_______ the teacher was busy writing on the board, the students at the back of the class were talking rather loudly.
A.Although
B.While
C.Since
D.As

I may never be able to come back to Turkey ______ I want to see as much as possible while I am here.
A.unless
B.because
C.although
D.so

You shouldn’t try to make a living as an artist _______ you have both talent and good connections.
A.unless
B.in spite of
C.however
D.just as

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