Question

Complete with can, could and be able to:a) We.......still considerComplete with can, could and be able to:
a) We.......still consider Leonardo da Vinci a man of outstanding ability.
b) He...... use both his hands with great ease.For drawing and writing he used his left hand,for painting he used his right hand.
C)He...............write backwards from right to left.
d) He tried hard to understand the"why" of everything but he.....................
e) Nature is too complex.One man solve the basic problems of creation,but let's hope that in future people...... solve all life's mysteries.

Answer 1

a) can
b) could/was able to 
c) is able to/can
d) couldn't
e) will be able to