When I ______to take part in the sport, I felt very surprised because I had never done this before

Excuse me, haven’t you learned the new lawEveryone in a car must wear theseat belt.– Sorry, we won’t do that again.

Mom is coming. What present ________ for your birthday?

eally very dangerous One more step, _____thebaby will fall into the well

Mary can speak Chinese fluently, _____ impressed me most.