He was watching her doing it with a _________ look on his face, as if to say that he would not change his mind.

Of the two, I would prefer     camera, which is very easy for me to carry.  

They came back from their long walk and went into bed,           .

I think you should go back to your ______ plan, which is much more practical than the present one.

     students are required to take the boat race.