You should look _______ into the matter to get more information about it.
The train arrived twenty minutes late, but we were not told what caused the ____. http:/
There are certain _______when you have to interrupt people who are in the middle of doing something.
Being able to speak another language well is a great _____ when you're looking for a job.
Few pleasures can equal ______ of a cool drink on a hot day.
---- “Haveyou seen _____ pen? I left it here this morning.” ----- “Is it _____ black one? I think I saw it somewhere.”