1. The compass Einstein got at the age of five is especially worth mentioning, because it ______. 
A) started his research on relativity
B) gave him the insight of its structure
C) sparked his curiosity in exploring the universe
D) helped him recover soon from the disease

2. We can safely conclude that Einstein's achievements are mainly due to his ______. 
A) curiosity, humor and passion
B) patience, humor and determination
C) determination, patience and passion
D) persistence, determination and curiosity

3. In the course of Einstein's intellectual development, he benefited much from ______. 
A) communicating intellectually with adults
B) playing with other children
C) dining with medical students
D) building houses of cards

4. Einstein's ability to explain profound theories in simple words shows that ______. 
A) he was good at condensing the essence of his thoughts
B) he had a good command of communication skills
C) he believed that beauty exists in simple things
D) he was an expert in organizing ideas

5. Mathematics performed a very important function in Einstein's scientific career in that ______. 
A) it helped him to stay with problems longer
B) it helped uncover the mysteries of the universe
C) it greatly enriched his childhood
D) it enabled him to prove the laws of Newton