请英语好的朋友帮帮忙造4个句子,

Now we have won an advantage over the enemy.
我们现在经赢得了对敌人的优势.
I was first to take the test
我第一个测试
We should make use of the chance.
我们应该利用机会.
Having realized what he meant,I went away.
我一明白他说的意思后,就离开了.