Use of Present Perfect and globalization

The world ______________ numerous natural disasters in recent years.

• has experienced

• have experienced

• didn´t experienced

• will experienced

Scientists ___________________ climate change for decades.

• has been studying

• has studied

• have been studying

• have study

Global health organizations____________ significant progress in fighting infectious diseases.

• have made

• have been make

• has making

• has made

Choose the correct question for this sentence:

The international community has been trying to bring peace and conflict resolution.

• When has the international community been trying to do in relation to conflict?

• Has the international community been trying to bring conflict?

• What has the international community been trying to do in relation to conflict?

• What have the international community been trying to do in relation to conflict?

Globalization ____________economies and connected nations in unprecedented ways.

• have transformed

• has transforming

• has transformed

• have transforming

People ______________ against environmental destruction around the world.

• has protested

• have protested

• have been protested

• has been protesting

The government ___________ new policies to address pollution.

• has implemented

• have implemented

• has been implemented

• have been implementing

Activists ___________awareness about endangered species.

• have raising

• have been raised

• have been raising

• has raised

Choose the correct question for this sentence:

Scientists have been studying climate change for decades.

• How long have scientists been studying climate change?

• How long has scientists been studying climate change?

• How long have scientists been study climate change?

• How long have scientists studying climate change?

The United Nations ​has _____________ on sustainability