Task 2Fill in the correct prepositions 介词 to complete the following sentences.1._________ every case they work smart and work extremely hard.2. Moved to tears, he resolved to plunge________ the new battles.3. The teacher is looking ___________ the students’ homework.4. She is obsessed ______________ the fear of unemployment.5. ____________ a certain extent his ideas are valuable.6. Science has brought __________ many changes in our lives.