根据句意选择正确的词组填空，注意使用正确形式

refer to,  be satisfied with,  lead to,  build up,  look down upon carry on,  come across,  focus on,  crowd in,   be intended for

I ________________________ this old photograph when looking for a book yesterday.
The professor gave the speech without ________________________ his notes.
We must try to _________________________ our work in spite of difficulties.
The book _________________________ beginners who want to improve their English grammar.
Some farmers _________________________ keeping their soil rich and free of disease.
Taking exercise will _________________________ your strength.
Eating too much sugar can _________________________ health problems.
The farmers ____________________________ the harvest that year.