3.
v. to observe the progress of something
4.
n. a regular repeated sound
5.
n. surroundings or conditions
6.
v. to investigate systematically
7.
v. to give up to another's authority
8.
v. to perform a scientific procedure
12.
v. to provide enjoyment or amusement
13.
v. to hold within or inside
15.
v. to hold with strength or support