One way to understand thousands of new words is to gain ________ good knowledge of basic word formation.
It was back home after the experiment.
is believed that improvement in health care will lead to a stronger , more prosperous economy .
----May I smoke here ? -----If you , choose a seat in the smoking section .
I like getting up very early in summer. The morning air is so good .
-----She looks very happy. She have passed the exam. ------I guess so. It’s not difficult after all.