Complete the gaps with forms of can, could be able to. Use one word only :
a) I Think Lisa ....... be albe to pass the exam next week. 
b)When I was a child I ........ not use a computer.
c)In the next six months she will ....... albe to drive.
d)They ...... speak Romanian because it's their mother tongue.
e)Last year John was ....... to run 100m in 16 seconds
f) ....... you able to slove this problem ?