21. Mary was so ___ in aprreciating the beautiful view that she didn't realize the weather was____.
. ________ to the trial, this small electronic device was only developed for military use.
. Do I have to go to your shop to pick the cake myself, ________ you will deliver it for free?
. Viewers will have _____ second chance to see Saturday’s concert on _____ Channel 4 tonight.
. — We are moving to Miami next week, Marilyn! — ________
. Anyone in the company should be aware ______ his duty and try his best to make contributions.