By the time he realizes he ____ into a trap, it’ll be too late for him to do anything about it.
– These plants ______ lack of water. --- You should have watered them.
_____ he stayed in England , he visited some of his friends.
You two follow me; the rest _____ where you are.
Dear Jenny, thank you for your letter which ______ on April 1st.
_________, they delivered the message as quickly as they could.