When VS While

​ ​ (a)   I was walking home, it started to rain heavily.

• While
• When

The phone rang ​ (a)   I was taking a shower.

• while
• when

​ (a)   she was reading a book, her cat jumped onto her lap.

• While
• When

He was playing football ​ (a)   he twisted his ankle

• when
• while

​ (a)   I arrived at the party, everyone was already dancing.

• When
• While

The lights went out (a)   we were watching a movie.

• while
• when

I was writing an email ​ (a)   my laptop suddenly shut down.

• when
• while

​ (a)   the teacher was explaining the lesson, some students were talking.

• While
• When

She was sleeping ​ (a)   her alarm clock went off.

• when
• while

I was looking for my keys ​ (a)   I found an old letter.

• when
• while