verb We (helped/ donated/ bought/ invited) vegetables to a nursery school last winter. 14. The lemonade isn't very sweet. I'll add some more (pepper/ salt/ lemon/ sugar). 15. Mona Lisa is a famous masterpiece, which was (painted/ composed/ directed/ performed) by Leonardo da Vinci. 16. Healthy habits help us keep fit and avoid (health/ energy/ condition/ disease). Risbey) 3th mor 17. What do you usually do (on/ at/ forl in) the summer holiday? 18. Yesterday, we (donated/ raised/ picked up/helped) litter around our area and recycled them. 19. This painting is prettier, but it is not (as expensive than/ as expensive as/ expensive than/ much expensive than) the other one.