depend entirely on

Englishtown
Topic: How to search the web like a pro

She is a news junky.　〜中毒(addicted to)

I depend entirely on the Internet.
I rely quite heavily on the Internet.
I am very dependent on the Internet.

We sift through all the rubbish to find relevant information.
shift through　〜をより分ける、ふるいにかける、取捨選択する

There is always a certain amount of trial and error involved.
a certain amount of　一定量の、ある量の
trial and error　試行錯誤、手探り

I have heard of someone being murdered by their online date.
You should be very cautious.
You should use a reputable website.　評判のよい、信頼できる

He was cheated out of lots of money.　（金を）だましとられる

It was like speed-dating.　出会いパーティ、合コン

radiotherapy　放射線治療
malignant tumor　悪性腫瘍