I tried to________ up the stairs unnoticed.

【单选题】 I tried to________ up the stairs unnoticed.

A、slip
B、slide
C、slick
D、slice

As I ran up the stairs, my foot_____and I fell.

A、 struck
B、 stuck
C、 slipped
D、 snagged

I looked up the word in a dictionary to________ its spelling.

* I tried to wake up my wife.* I rang the doorbell.* She was fast asleep.I tried to wake up my wife by