In order to increase the______ of the farm______, our government offers a lot of money to the peasants every year.
— Why does the river smell terrible? — Because large quantities of polluted water _______ into it.
Xi’an was the last city ______ he visited when he came to China.
The music ______ she is dancing sounds beautiful.
______ time ______, what the scientist said finally proved to be true.
Mary never does any reading in the evening, __________.