She demanded (v.) an immediate explanation.
The siren was a signal (n.) for everyone to leave the building.
They were heading towards (prep) the German border.
There is an equal (adj.) number of boys and girls in the class.
It would be interesting (adj.) to know what he really believed.
f. to ask for sth very firmly
e. a movement or sound that you make to give sb information, instructions, a warning, etc.
c. the difference in size
a. attracting your attention because it is special
g. the same in size or amount
d. in the direction of sb/sth
b. to tell someone seriously