When did she _________—She arrived late. When she _________ the theatre, the movie had been on for 30 minutes.

There is_______ “s” and_______ “u” in the word “sun”.

What did you ____ just now–I _____ you if you could follow me.

The word “track” ________ a path which is made of earth ________ having a surface covered with other materials.

New ways have been found to prevent the river ______.