It was not immediately obvious _____ water was to be fundamental to the development of life.

I feel it is your husband who ________ for the spoiled child .

Elephants have their own way to tell the shape of an object and ________ it is rough or smooth.     

-------Do you need any help, Lucy?-------Yes. The job is _________ I could do myself.

________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!