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Our research measures the impact of_______ on this particular eco-system.

A. human activity

B. sea level    

C. greenhouse gas

D.   global warming

Choose the correct modal: You ___ finish your work before the deadline. (should/might)

A. could

B. would

C. must

D. should

I told him I____something to show to his brother last week.

A. Have

B. Has

C. Had

D. Havehad

. We ___ in this house since 2012.

A. have lived

B. lived

C. are living