It was____ that the writer read an article in ESJ which helped him understand the "ghost hair" thing.

__ (尽管困难重重), they continued their experiments and made great discoveries in the end.

With increasing popularity of digital TV and set-top boxes, the debate on public funding for the BBC is __ .

Speaking of the online technology available for marketing, the author implies that the focus of the marketing change is on______.

I agree that______(世故的成人而不是孩子) are to blame for the problems in our education system,

________(要不是下雨), we should have had a pleasant picnic.