Halfway up the mountain we stopped to______________.

The level of the river ___ 20 centimeters over the security line and ____must be taken to control the flood.

If you are _______ about Australian cities, just read the book written by Dr. Johnson.

Have you seen _________ TV series Nirvana in Fire （《琅琊榜》），Mum-Yes，it’s quite _________ interesting play，so I have seen it twice．

_______difficulties we may come across, we will help one another to overcome them