219.The teacher demanded that his students _____ street food if they didn’t want to get sick. (A) would avoid (B) avoided (C) avoid (D) to avoid

222.To understand bees better and to help them survive even in urban environment, a group of biologists at Queen Mary University of London _____ currently _____ the London Pollinator Project. (A) are； sponsoring (B) have； sponsored (C) will； sponsor (D) were； going to sponsor