Jim, hurry up, ________ we’ll be late for the concert.

–_______________ does a CRH train run? –It runs up to more than 300 km an hour. 

I’d like to go swimming _______ the water is too cold. 

--Would you like to go bike riding with us tomorrow?  ---Sure, ____ I am busy.

Some of the students are nearsighted______they spend too much time watching TV or playing online games.