这本小说是以一系列书信的形式写成的。

The novel is written ___in ___the ___form ___of a series of letters.

这种药以液体或药丸的形式出现。

The medicine comes ___in ___the ___form ___of a liquid or pills.

对于这一切，我只能说我要求立即退款，或者以一次真正去一个真正国家的旅行作为补偿。

For all this, I can only say that I want my money back immediately, or some compensation ___in ___the ___form ___of a real trip to a real country.