Group work is a method of teaching ______ tasks and activities are carried out by small groups of pupils.
A. which
B. that
C. for which
D. in that
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Einstein’s theory of relativity seemed hard to believe at the time ______.
A. when he first introduced
B. when he first introduced it
C. he first introduced
D. which he first introduced it
Now we may be able to say ______ between music and noise or just sound.
A. what is the difference
B. the difference is what
C. what the difference is
D. that what the difference
Contrary to ______ I had expected, he lost for a second time.
A. that
B. what
C. which
D. who
Professor Smith was so punctual ______, he always arrived to class just as the bell rang.
A. that the day he died
B. until the day he died
C. that until the day he died
D. until the day when he died