If we have no definite aim before us (1)/ we would only wonder about in aimless pursuits (2)/ and achieve nothing. (3)/ No error. (4)

Answer

2

Explanation

wander will replace wonder about wonder about : to be curious/in doubt about some one/something Wander (of a person.s mind/thoughts): to stop being directed on something and to move without much con trol to other ideas, subjects, etc. Look at the examples given below: I wonder about life on other planets. Try not to let your mind wander