Though some foreign scientists had a ________ opinion of his new invention, his fellow workers never thought ________ of it.[ ]

The Arabian Nights _____ well known all over the world, in which many a story _____ interesting andinstructive.[ ]

It is in the west of China _____ there is no doubt_____it is going to rain tomorrow.

If it hadn’t rained so hard last night，it_______ so cold today.

We have produced 15% more cotton this year____ we did last year