In this experiment, the famous professor showed three different __________ to the study of physics.
This kind of clothing material, ________soft and smooth, sells well.
— I’ve told Nancy many times about the meeting, but she still forgot it!— I understand. Actually, anyone ______ be very forgetful at times.
The small window in the wall could ______ some light into the room.
As we know, _______ medical examination will help us find out health problems as early as possible.
Some exercises appear to be ______ ones you have done, but on ______ second thoughts, you’ll find that they’re different.