16.Nobody knows who is the first one to add fertilizer ___ the soil to make plants grow better.
| A．to | B．in | C．into | D．on |
That hotel is always full because it offers a friendly ______ and personal service.
A surface B. atmosphere C. system D. appearance
_____ work has been done to prevent the river being polluted.
A .A number of B A mass of C Several D. A good many
. I was sleeping when the fire ______ and then it spread quickly.
A. broke out B put out C. came out D. got out
_______ you do it, you’d better do it well.
A. Now that B After C. Although D. As soon as
He has ____ for language, while his sister is a ____ pianist.
A gift, gifted B a gift; gifted C. a present; gifted
D. a gift; gift