The sentences are as follows:

1. There is a lush osmanthus tree in the center of grandma's yard.

2. There is a tall osmanthus tree in the center of the wide yard.

3. The autumn sun shines in the center of the yard and shines on a osmanthus tree full of osmanthus.

4. There is a sweet osmanthus tree in the center of Xiaoming's yard.

5. In the middle of the yard, there is a osmanthus tree, full of green.

6. Every autumn, there is always a sweet-scented osmanthus tree in the center of the country yard.

problem-solving skills of supplementary sentences:

1. Understand the whole paragraph, which is the premise of solving problems. If you don't understand the whole paragraph, it's easy to answer irrelevant questions. Because the filled sentences are also unified in the meaning of the whole paragraph.

2. Analyze the logical relationship of paragraphs and be good at accurate and effective layering. Being able to accurately understand in layers can not only help to understand a paragraph, but also narrow the answer range of each vacancy, which is not easy to deviate from the topic.

3. Pay attention to reasonable deduction. Deduction itself is a kind of ability. Deduction according to the content of context is a necessary means to solve this kind of test questions.

4. Pay attention to the modification. After the first draft of the test questions is drawn up on the draft, put it back in the original text and read it. If it doesn't match or feel inappropriate, it should be revised.