A mother planted many kinds of vegetables in her garden. One day, she said to her 31________, “Betty, come here. Look at all these little yellow marks on the 32________ of the cabbages. They are eggs of a kind of insect(虫子). They are very beautiful but very bad for cabbages. This afternoon you must 33________ all the eggs on the leaves and kill them. In this way, you will help us have 34________, greener and bigger cabbages.”
Betty didn’t think she could do it 35________ and in the end she forgot all about it. The mother fell ill for a few days and 36________ work in her garden. When she was well, she took Betty with her to the garden to see the cabbages. To 37________ surprise, the insects had eaten every leaf. When Betty saw this, she began to 38________. Then her mother said to her, “We should never put off what we have to do today till 39________. And you must learn to deal with the bad things while they are small, 40________ it will turn into a big problem.
A son  B. mother   C daughter 
A tress   B. leaves   C. grass
A find   B. eat   C. fly
A worse   B better   C thinner
A at most   B at last   C at once
A must   B couldn’t   C need
A my   B their   C his
A cry   B wait   C run
A yesterday   B today   C tomorrow
A. but      B. or     C. and