If we __________enough rain last year, we___________a good harvest this year.[ ]

(2009湖南娄底重点高中联考) students are required to take part in the boat race．

I don’t think these English problems are difficult ______.[ ]

Finally he reached a lonely island ________ was completely cut off from the outside world.

It was only a very short time _______ the young lady found her cellphone stolen as she got on the crowed bus