U.S. President Barack Obama on Wednesday paid honor to health care workers who have treated Ebola patients in West Africa, calling them “heroes”_________ to be applauded rather than discouraged.
The _____ look on his face suggested that the teacher was quite _____ with the result.
______, I came to realize that my parents could not always stand by me.
In my opinion, more attention should be ______ the environment, which is of great importance.
I owe my success to Mr. Smith, a teacher from America, ______ help I have greatly improved my oral English.
Many species are in ______ danger of extinction now due to the foolish actions of ______ human race.