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Generally speaking, suction heads require to be （） for high speed or large capacities than for low speed or small capacities.

Every act of assistance or salvage，which has had a useful result，should give a right to （）remuneration.

It is generally considered unwise to give a child___( )_____ he or she wants.

（）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.

Children who are not active or ______ diet is high in fat will gain weight quickly.

A （）can give power to hoist or lower cargo.

（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.

In speed reading, looking at your watch every 5 or 10 minutes ______.

Who do you like better, your father or mother? Why?

Do you like your hometown? Why or why not?

If you do not know the subject, you will not understand what is said or written, even if English is your mother （） what is said or written.