This is John’s photo. We miss him very much. He ________ trying to save a girl in the earthquake.
The dodo became extinct fairly recently so its DNA is still ________ .
Exactly when the first people arrived in ________ we now know as California, no one really knows.
The patent officer ______ with my file explained to me that a plant variety is not a/an _______ invention as it is a result of adjusting growth scientifically.
The scientist __________ the experiment for half a year, but he _______ yet.
Seeing the picture, I couldn’t resist ______the days_____ we spent together.