Answers exercise 11 page 57
a. to accelerate - 4. to go faster and faster
b. respondible - 8. when it's your job to take care of something
c. impressive - 5. when something makes you feel respect.
d. ridiculous - 3. very silly or foolish
e. gravity - 6. force which pulls everything down
f. terrified - 1. very afraid
g. to matter - 2. to be important
h. fearful - 7. afraid