根据含义意思完成句子,一空一词.

根据含义意思完成句子,一空一词.
1.为了保持健康,平衡饮食很重要.
To stay healthy,it's important to eat a ______ _____.
2.当他进来时,我正在做家庭作业.
I was doing my homework ______ ______ ______ he came in .
3.你能给我提些关于买哪种电脑的建议吗?
Could you give me some ______ ______ which computer to buy?
4.昨晚直到11点他才回来.
It was ______ ______ eleven o'clock ______ he came back last night.