GEI-1, UNIT1 GRAMMAR

Mount Everest ___ (climb) by thousands of adventurers every year.

• is climbed

• climbs

• was climbed

• has climbed

The Grand Canyon ___ (form) over millions of years by erosion.

• is forming

• was formed

• formed

• is formed

Many photos ___ (take) of the Northern Lights last winter.

• take

• are taken

• were taken

• was taken

The Amazon Rainforest ___ (know) as the "lungs of the Earth."

• is known

• knows

• was known

• is knowing

The Great Barrier Reef ___ (protect) by conservation efforts today.

• is protected

• protects

• was protected

• protect

Yosemite National Park ___ (establish) in 1890.

• establishes

• was established

• is established

• has established

New species of plants ___ (discover) in tropical rainforests every year.

• are discovered

• were discovered

• discovered

• is discovered

Stonehenge ___ (build) by ancient civilizations thousands of years ago.

• is built

• was built

• builds

• is building

The Sahara Desert ___ (cover) by sand dunes that constantly shift.

• is covered

• covers

• was covered

• has covered

National parks ___ (visit) by millions of tourists annually.

• visit

• are visited

• was visited

• is visiting