[ Conjunction ]
I am very tired _____________ I have been working all day.
A. so
B. because
C. therefore

Random Topics:
Past and Present ContinuousPrepositionPresent/Past/Past ParticpleEssential and Nonessential ClausesNouns FormationExpressing Obligation and ModalsGrammar RulesModal Auxiliary VerbsPhrasal VerbsConjunctions and CommasOther quiz:
Vocabulary and Grammar › View. Travelling is _____ because it makes you realise people are the same wherever you go.
A. residential
B. beneficial
C. skilled
D. energetic
Vocabulary › View
(n.) courage and initiative; common sense
A. gumption
B. paradigm
C. malapropism
D. hegira
Gerunds and Infinitives › ViewI expect ______ (graduate) next year.
A. graduating
B. to graduate
Articles › View
This is my uncle Phil. He’s ____ teacher and he lives in London.
A. a
B. an
C. the
D. –