1. Filling in the blank .Change the form if necessary.yieldcurbstuffedembarrassedposeWhen she heard it was snowing in the city they were going to, she _____ two more sweaters into her bag.Some people believe that the earth can _____ enough food to support at least twice its present population.He was _____ when he discovered that he didn’t have enough money to pay for the red wine he had ordered.The new system designed to _____ harmful emissions from factories will be put into use soon.There is widespread concern that the rising unemployment may _____ a threat to social stability.