The doctor is trying to save the patient by every means _______

I think the environment is becoming worse and worse.— Yes, I really don’t know we can do about it.

The students in the international school are encouraged to voice whatever opinions they have andquestion authority, which helps to develop their______ thinking. [ ]

Why are you crying Today is your birthday!—____________. I am so excited with so many friends surrounding me.

Mr. Brown is a friend of ________ . They often talk with each other on the Internet.