Professor Johnson is said _____ some significant advance in his research in the past years.
A、havingmadeC
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YouthatlettertoJames.However，yodidn't（）.
If a substance is dissolved in water or heated ， it may （）a gas.
Of course，（）most immigrants did not get rich overnight ， but the of them were eventually able to improve upon their former standard of living.
_____ time, he’ll make a first-class tennis player.
Thebackgardenofourhousecontainsalawn，____verypleasanttositoninsummer.
