根据所给词的适当形式填空。 1. How ________ (more) salt will you put in the dish? Only a little. 2. Tina__________(buy) some interesting souvenirs for kids on her trip to China. 3. I spent half an hour________ (make) a bottle of delicious apple smoothie. How happy I was. 4. Fifteen minutes is enough for you ________ (cut) up some tomatoes. 5. You need ________ (add) some red sugar to the soup. It's really strong! 6. Why not ________ (turn) off the TV? You have lots of homework to do. 7. Would you like some ________ (butter) on the bread? 8. He worries about ________ (get) there in time, because he doesn't have a bike. 9. It's easy for her ________  (work) out the math problems. 10. ________  (wait) for someone for a long time often makes me feel tired.