[ Grammar Clauses ]
Not enough sleep is the reason ___ many people suffer from fatigue.
A. why
B. where
C. whatever
D. although
Select your answer:

Random Topics:
Suffixes and TensesSuperlative AdjectivesPreposition FormSimple Present and Simple PastQuantifiers: too many, too much & enoughWas and WereGrammar - TOEICGrammar-Verbs & Nouns Singular, Plural, GenderVerb and PrepositionGrammar and SyntaxOther quiz:
Tenses › ViewThey _______ (to build) a new house next door.
A. build
B. builds
C. are building
D. built
Future Tenses › View
I’m a bit scared because I … the doctor this afternoon.
A. am seeing
B. will see
C. see
