Môi trường ở đây đã xác định là môi trường mà chúng ta cần bảo vệ, hơn nữa some/ a/ an ở đây đều là các mạo từ không thể đi được với environment
He is jealous .............. his rival's success.
Mary married a wealthy man. She got married .............. him last June.
I can't get this ring .............. my finger.
I shall wait .............. you.
These goods are free .............. duty.
I have taught English .............. 6 years.
Elizabeth is fond .............. going to dances.
I have twenty students .............. my class.
He wasted little time .............. social formalities.
It was .............. my will.
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