In 1900, the United States ranked first in the world in the production of ________.
It is important to ________ your skin from the harmful strong sunlight.
The farming methods have been ________ improved with the invention of the new machine.
“The dignity of movement of an iceberg is due to only one- eighth of it being above water. ” This “iceberg ” analogy is put forward by( ).
虽然我浑身酸痛，可是不干活儿不行呀!（）
His intelligence will ________ him to get a scholarship to college.
Since we have a focused subject ，we should not talk ________.
They should try to ________ their usual inhibitions and join in the fun.
Water is composed _______ hydrogen and oxygen.
A mong the following words, “ ______ ” does NOT have inflectional affixes.