I ______ to the gym every single morning before heading to the office.

He ______ the main door securely before he went out for a walk....

She looks extremely exhausted; she ______ very hard lately....

I ______ this book all morning, but I still have three chapters left....

Look! The little boy ______ across the busy street!...

Identify the error: She is taking piano lessons since she was seven ye...