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Endangered species may be at risk due to factors such as habitat loss, poaching and _____ species

• invasive

• invade

• invasion

• invasively

________ United States is a country in North America.

• The

• A

• An

• No article

Her explanation of the phenomenon was so confusing that I couldn't _____ anything.

• take in

• put back

• call for

• go over

Your brother has been shortlisted for the interview, _____ ?

• did he

• didn't he

• hasn't he

• has he

He entered the room quietly while she _____ a romantic piece of music on her piano.

• was playing

• is playing

• has played

• plays