下列各句中，加线词语使用恰当的一句是(　　)

I don’t know how to write the article assigned by our professor on international trade. -You should have ______ your attention on the lecture that ______ how international situation affectsexports and imports across the globe.[ ]

Speaking in an inspection in Yunnan Province, Xi Jinping said authorities must _______ poverty removal efforts to support the building of a rich and successful country.

Mike, it’s getting cold. _________ take a jacket with you—All right, Mum.

English is a language that many people around the world ____ not speak perfectly but ____ at least understand.