“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
Is _______ some German friends visited last week?
-- We are going to hold a sports meeting tomorrow.-- __________ it rains?
She was scared _______ when hearing the sound of explosion.
—Are you going to take part in the speech contest? — ___________. It’s too good an opportunity to miss.
When I was young, I was always ____ to my elder brother wherever he went.