Exercise 2. Choose the correct option for each of the following questions.

People celebrate Tet with fireworks and lion dances, (which / that / what) shows how rich Vietnamese culture is.

Many students join cultural exchange programs, (those / which / that) helps them broaden their worldview.

Cities are growing rapidly, (when / this / which) leads to increased demand for housing.

Urban areas often suffer from air pollution, (which / that / where) is harmful to people’s health.

The government is building more green spaces in the city, (where / which / what) improves residents' well-being.

People are encouraged to recycle more, (that / which / who) reduces waste going to landfills.

The company switched to eco-friendly packaging, (whose / which / this) was welcomed by environmental groups.

Plastic takes hundreds of years to decompose, (whom / which / that) poses a serious environmental threat.

The robot was able to detect diseases early, (when / why / which) surprised the researchers.

AI can perform repetitive tasks more efficiently, (then / which / that) saves time and money.