Fill in the blank.
Annie broke her leg while ____ (Throw) the ball.
Throwing
she has be studying english for 2 years.
been
How long has it ____ (be) since you ____ (know) Hailey?
been / knew
they were planned to visit the museum, but it started raining heavily.
planning
I went to the grocery store, but I ______ (forget) my grocery list.
forgot
she enjoy reading books in the evening
enjoys
my mom loves to cook, she's _____ (bake) some cookies.
baking
She have finished her work before the game started
had
_____ she _____ (return) home from from her holiday yet.
has / returned
By the time we arrives at the airport, the flight had already left.
arrived