To Americans, it is impolite to ask someone about age, ________and salary.

A. marry B. married C. marriage D. marrying

The panda’s __________ habitat is the bamboo forest.

A. nature B. natural C. naturally D. natured

WHO’s main activities are carrying out research on medical _______ and improving international health care.

A. develop B. developing C. development D. develops

Vietnamese athletes performed_______ and won a lot of gold medals.

A. excellent B. excellently C. excellence D. excel

Don't forget to say goodbye to the ___________ before leaving the office.

A. interviewer B. interviewing C. interviewee D. interview

Housework is ________ shared between them.

A. equally B. equal C. equality D. equalizing

These quick and easy _______ can be effective in the short term, but they have a cost.

A. solve B. solvable C. solutions D. solvability

Are you sure that boys are more _______ than girls?

A. act B. active C. action D. activity

Electronic music is a kind of music in which sounds are produced ________.

A. electron B. electric C. electronic D. electronically

Some species of rare animals are in ________ of extinction.

A. danger B. dangerous C. dangerously D. endanger