He is ______ that he does everything very well.
The rivers will become dirtier and dirtier ______ we take action to protect them.
It is helpful to ________ a good habit of reading in language learning.
-- It will be my turn. I feel a little nervous.--________ You can make it!
-- What was Jim wearing at the party?-- Nothing ________. He was in his usual shirt and jeans.
-- Tony, ________ are you in such a hurry?-- The meeting will start soon. I don't want to be late.