Do not let any failures discourage you, for you can never tell ______close you may be to success.
Don’t worry! Philip is quite used to in such busy streets as this.
The teacher was angry about his being late for class, but he behaved ______ nothing had happened.
Candidates ______ remain in their seats until all the papers have been collected.
—Excuse me, Dad, but I’m going to the club to meet my friends in the football team. —OK. ______
His ears are highly ______ to any unusual sound in the machine, that is how he found the fault.