History
____________ had been built for the 1889 World's Fair before it became a symbol of Paris.
The Eiffel Tower
Form a question: Erika and Anna / learn / the new dance
HAD Erika and Ana LEARNED the new dance?
Apple had invented the __________, an item for listening to music, before it released its first smartphone (iPhone). (TECHNOLOGY)
iPod
If we had eaten the cake, we ____________ (get) in trouble.
If we had eaten the cake, we WOULD HAVE GOT in trouble.
The first modern ___________ had been held in Athens in 1896 before they became an international event.
Olympic Games
Before the first moon landing done by USA, _________ (country) had already gone to space.
Russia / USSR
She _____ already _____ her homework when I called her.
She HAD already FINISHED her homework when I called her.
By the time the human genome was sequenced in 2003, researchers had already mapped a significant portion of _ _ _. (BIOLOGY)
DNA
If I _________ (visit) the US last year, I would have gone to Disney World.
If I HAD VISITED the US last year, I would have gone to Disney World.
The ________ had already sailed from England before the iceberg collision occurred.
Titanic
This person had been the US president before Biden won the election.
Donald J. Trump
We ________ (not travel) to that country before our recent trip.
We HADN'T TRAVELED to that country before our recent trip.
Before Marie Curie discovered radium, scientists had identified several elements in the _________ table. (CHEMISTRY)
periodic
If we ____________ (use) less fossil fuels, the planet would have stayed cooler.
If we HAD USED less fossil fuels, the planet would have stayed cooler.
Before the invention of the __________, people had communicated mostly by letters or telegraph.
telephone
The Egyptians had already constructed the __________ long before Jesus Christ was born.
pyramids
Form a question: she / ever / be / to Paris / before her vacation?
HAD she ever BEEN to Paris before her vacation?
By the time _____________ published his theory of relativity, scientists had made significant advancements in understanding electricity and magnetism. (PHYSICS)
Albert Einstein
My friend ______________ (not come) to my party if I had not texted him to remind him.
My friend WOULDN'T HAVE COME to my party if I had not texted him to remind him.
___________, the largest state in the US at the time, had been part of Mexico before it was annexed by the US.
California
By the time ___________ "discovered" the Americas in 1492, the indigenous peoples had already established complex civilizations.
Christopher Columbus
By the time I arrived, they ________ (leave) the party.
By the time I arrived, they HAD LEFT the party.
By the time the theory of evolution was widely accepted, ______________ had already completed his groundbreaking research on natural selection. (BIOLOGY)
Charles Darwin
If the weather _________ (be) better, we __________ (go) hiking.
If the weather HAD BEEN better, we WOULD HAVE GONE hiking.
By the time the ________ Empire fell in 476 AD, it had conquered much of Europe, North Africa, and the Middle East.
Roman