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.