用下列其中一个单词把下列句子改写成倒装句never before,not,not until,only by,on no account,scarcely

用下列其中一个单词把下列句子改写成倒装句never before,not,not until,only by,on no account,scarcely
Write new sentences with a similar meaning beginning with one of these adverbials
never before not not until only by on no account scarcely
1.The door could not be opened without using force.
2.This was the first time the race had been won by a European athlete.
3.The plane had only just taken off when the smoke started to appear in the cabin.
4.She made no sound as she crept upstairs.
5.This window must not be unlocked without prior permission.
6.He only thought about having a holiday abroad after he retired.