33. When a student asks_________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
.In the country area about one in ten ______ have enough to eat.
Now the city is ______ it used to be.
The buildings of this style can be seen _________.
30 % of the young trees, attacked by diseases, ________pine trees.
Tomato, which used to be called “love-apple”, is not ____but ______.