______ difficult it is, he is determined to ______ the experiment.
He’s still suffering ___headche. He can't get rid of it.
--Are you going to visit the exhibition this afternoon?—I’m not sur.Perhaps I’ll find __ other time.
I hate ___ at noon every day.
This poor boy was treated so ___ by his stepmother that we all helped him.
--The wall of your room doesn't look nice. ---I wish I ___ it green.