根据汉语意思完成句子，每空一词。
1. 虽然他讨厌练小提琴但还是坚持下来了。
He ________ ________ practicing the violin though he hated it.
2. 这个盒子里填满了书。
The box ________ ________ ________ books.
3. 我在伦敦工作时偶尔会去看他。
I went to see him ________ ________ ________ ________ when I worked in London.
4. 他们出发度假之前关闭了煤气。
They ________ ________ the gas before going on holiday.
5. 这些蔬菜总共多少钱？
How much are these vegetables ________ ________？