A large number of persons gathered closely together

(a)  

To calculate or reckon

(a)  

Extraordinarily large in bulk quantity or extent

(a)  

A difficult question that is asked as a game and that has a surprising or funny answer

(a)  

To determine how heavy or light something is

(a)  

Young people, especially teenagers

(a)  

having the ability to make new things or think of new ideas

(a)  

a thought or plan about what to do

(a)  

a way of fixing a problem

(a)  

to find a way to end a problem, to find the answer

(a)  

to be interested in knowing or learning something

(a)  

having necessary power, skill, resources, or qualifications

(a)  

worldwide

(a)  

to make better

(a)  

knowledge communicated or received about a particular fact

(a)  

an important point, matter, dispute or decision

(a)  

to make an effort to do something

(a)