[ Noun Clause ]
The teacher explains … the earth evolved.
A. what
B. why
C. where
D. when

Random Topics:
Perfect Tenses of VerbsReflexive pronounsSo / Neither / Either / TooPast simple vs Present perfectAdverb ClausesPhrase or ClauseSimple and Past TensesFigure of SpeechTensesand, so, but, becauseOther quiz:
Grammar for TOEFL › ViewSince an immediate change was needed on an emergency basis, _____ by the governor to curtail railway expenditure.
A. so it was proposed
B. was proposed
C. because of the proposal
D. it was proposed
Tenses › View
His dad comes to pick him up in the afternoon.
A. Present Simple Tense
B. Present Continuous Tense
C. Simple Past Tense
D. Past Continuous Tense
Grammar › ViewLinda ran away when she saw a ………. of bees approaching.
A. colony
B. swarm
C. litter
D. troop
Degrees of Comparison › View
Honesty is the _______ policy of all.
A. Better
B. Best
