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Julia left the restaurant after she __________eating.

A. had have finished

B. had finished

C. have finish

D. has finished

Choose the correct option to fill in the blanks with suitable prepositions.

Africa, the origin of life, abounds _______ endless red deserts and intolerably hot storms.

A. by

B. upon

C. with

D. through

In 21st century, scientists continue to look for new ways _____ serious disease and slow down the ageing process

A. to treat

B. treat

C. treatment

D. treated

a system of ideas to explain something

A. servant

B. evaluate

C. theory

D. preserve