-----Where is my key? I remember I put it here yesterday.--------You ______  it in the wrong place.

Mary ______ my letter; otherwise she would have replied before now. 

On rainy days, accidents ______ happen sometimes on steep roads．

“Mary looks hot and dry.” “So _____ you if you had so high a fever.”

--Whose T-shirt is this? --It ____ be John’s. It’s ______ small for him.