[ Tenses ]
Systematic ocean exploration in the United States of America ____ in 1807 when Thomas Jefferson ___ the survey of the coast.
A. will begin / will authorize
B. began / authorized
C. has begun / has authorized

Random Topics:
Phrasal Verbs with up and downPre-intermediateModal Verbs and ConjuctionsPresent and Past TensesPassive Voice & TensesWho am I?Infinitives and ING FormsAdverb of MannersPresent Tenses: Simple vs ContinuousPresent ContinousOther quiz:
Past Tenses › ViewJason _____ (be) really tired because he _____ (work) all day.
A. was – had been
B. was – were working
C. was – had been working
Vocabulary and Sentence Structure › View
The city we live in is expanding, and more high-rise buildings are being built here.
A. getting bigger
B. getting smaller
C. changing
D. growing
Future Tenses › ViewTo make a promise we use…
A. present simple
B. be going to
C. future simple
D. future continuous
Relative Clauses & Real Conditionals › View
Choose the appropriate first conditional sentence: If I see him tomorrow, I ______ him about the meeting.
A. told
B. will tell
C. would tell
D. tell