英语同义句转换1,I can't decide which one I should buy改为I can't deci

1,I can't decide which one I should buy
改为I can't decide _____which one to buy_________________
2,He didn't know when he would leave
改为He didn't know______when to leave_____________
3,I told him where he could buy the book
改为I told him______where to buy the book_________________

1.which one to buy
2.when to leave
3.where to buy the book