subordinating conjunctions

Builders use plywood in the construction of small boats ......... it is easy to shape.
(a) although
(b) because
(c) after
(d) while

I haven't spoken with Jane ......... she moved.
(a) unless
(b) while
(c) since
(d) although

Airplanes sometimes fly to unscheduled cities ......... the weather is bad.
(a) when
(b) where
(c) wherever
(d) whereas

Please read the book ......... it's still available from the library.
(a) before
(b) although
(c) since
(d) while

Everybody had dessert ......... they finished eating the main course.
(a) while
(b) because
(c) until
(d) after

The pep rally won't begin ......... the last class of the day has ended.
(a) until
(b) so that
(c) since
(d) than

Elena will groom the horse in the morning ......... she can ride it in the afternoon.
(a) until
(b) unless
(c) so that
(d) when

You will receive extra credit ......... you turn in your project early.
(a) although
(b) than
(c) if
(d) unless

The concert will end at 10.30 p.m. ......... the audience insists on several encores.
(a) while
(b) unless
(c) though
(d) as

......... they feel threatened, dogs sometimes display aggressive behavior.
(a) Until
(b) During
(c) When
(d) Before

**REFLECTION:
I like this kind of activity because I can practice everything that I learned in the class. I have to practice more to improve my writing skills.

** SOURCE:
http://www.english-test.net/esl/learn/english/grammar/ii171/esl-test.php
November 20th 2008