---What are you going to do this weekend ?--- Well, we’ll clean up the city parks ________ it rains..

They will give the award to_____devotes themselves to the protection of wildlife. 

—Is Paul playing basketball for his school?—Well,he ____.But he has given it up and switched to playing volleyball.

Although he knew little about the work done in the field, he succeeded ____other more experienced experimenters failed. 

Many young people in the West are expected to leave __    could be life' s most important decision -- marriage -- almost entirely up to luck.