[ Adverb Clauses ]
__________ knowledge can be acquired from books, skills must be learned through practice.
A. But
B. While
C. As
D. Since

Random Topics:
Present Simple: affirmative, negative, interrogativeDefinite vs Zero Article Abstract NounsComparison Degree & GerundsGrammar - FragmentsThere is, There are, Some, AnyPresent Simple & ContinuesSo, Such, Many, MuchCoordinating Conjunctions and Comparative AdjectivesModals for ObligationPassive Voice, Question Tag, PrepositionsOther quiz:
3rd Person Singular › ViewJenny never … the bus.
A. miss
B. missis
C. misses
D. misss
Grammar › View
Jonathan ____ be very embarrassed after falling over because his face is really red.
A. can´t
B. must
C. might