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Read the text, complete it giving your comments.

to call, to know, to begin, to appear, to picture, to sell, to teach.

There was an old farmer. (1) He always worked hard, but his sons didn’t. The farmer wanted ... his three sons how to be good farmers. So he ... them and said:” My dear sons, I want you ... that there is a great treasure buried in the vineyard. Promise me that you’ll look for it after my death.
The sons promised (2) and they ... looking for the treasure. They worked very hard in the hot sun (3). In their minds they ... boxes of gold coins, diamond necklaces and other such things. (4) But they found not a single penny. They were very upset. (5) But then the grapes started ... on the vines and their grapes were the best in the neighbourhood. And they ... them for a lot of money.
Now they understood ... .