1．What on earth led you to_change (change) your mind at last?
2．The mother sacrificed many things to_get (get) her daughter a good education.
3．Given (give) another hour，I can also work out the problem.
4．Having suffered a lot from wars，people in that area call for an end to wars eagerly.
5．Increased production will，in turn，lead to increased profits.
Ⅱ.单句改错
1．Only by this mean can we master English.mean→means
2．Pack ice around Iceland was becoming a threat with navigation.with→to
3．We must obey the principle all men are innocent until they are proved guilty.
principle后加that
4．The policeman seized the thief by his arm immediately.his→the
5．Having trapped in the traffic jam for hours，he became impatient.
Having后加been
