[ Vocabulary ]
Experts say that the _______ of the world could be over 7 billion by the year 2015.
A. number
B. population
C. rate
D. quantity

Random Topics:
Modal Verbs for PossibilityPassive of Modal VerbsActive & PassiveFuture Time and TensesPast TensePast TensesLinking Verbs and TensesSubject/Verb Agreement with Collective NounsGerund after Prepositions and Certain VerbsComparative AdverbOther quiz:
Modals for Obligation › ViewDid you _____ extend your visa so that you could stay for longer?
A. must
B. ought to
C. have to
D. should
Vocabulary › View
ABRUPT
A. TO DRAW TOGETHER OR BECOME SMALLER
B. SUDDEN
C. BRIEF TO THE POINT
In a big city like New York, __________ Jodie lives, it isn’t easy to meet people.
A. where
B. which
C. that
D. when
Grammar › View
We … In this restaurant 2 days ago
A. Ate
B. Eaten
C. Eating
D. Eat
