press the red button ,_______you will setoff the alarm

Today is the best day of my life! All my years of training as an explorer have finally ______! [ ]

Shall we go swimming on Sunday or Saturday— _________is ok ! I will be free .

The woman who’s carrying a baby in her arms, _________aboard first．Don’t crowd in!

People in China used to keep records by putting a number of stones together, ___?