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

小题1:I ________________________ this old photograph when looking for a book yesterday.
小题2:The professor gave the speech without ________________________ his notes.
小题3:We must try to _________________________ our work in spite of difficulties.
小题4:The book _________________________ beginners who want to improve their English grammar.
小题5:Some farmers _________________________ keeping their soil rich and free of disease.
小题6:Taking exercise will _________________________ your strength.
小题7:Eating too much sugar can _________________________ health problems.
小题8:The farmers ____________________________ the harvest that year.