I have never dreamed of ______such a beautiful place in the world.[ ]

It’s a pity that Wang Qiang failed in the driving test again.—How can you expect him to pass _______ he hasn’t been practicing enough?

Lately some scientists are experimenting _____ white mice to _____ this kind of medicine[ ]

Henry was away from home for quite a bit and _______ saw his family.

________ was known to them that the boss had broken his promise ________ he would give them a rise