请英语好的朋友帮帮忙造4个句子，拜托各位

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。