I may go hiking with my friends this weekend if there's ________ (充足的) time.
My grandpa had poor memory in his 90s and often ________ (弄错) me for my brother.
I feel I'm a bit ________ (落后) with my work so I want to make it up again.
In our country it's ________ (违反) the law to drive after much drinking.
A Bite of China is an interesting documentary that I've watched several ________ (回).
The discovery of the new medicine has ________ (挽救) millions of lives across the world.
