Ladies and gentlemen, please remain ______ until the plane has come to a complete stop.
This is the only way we can imagine _______ the overuse of water in the students’ bathrooms.
Studies show that people are more _______ to suffer from back problems if they always sit before computer screens for a long time.
--- How do you ofen spend your time? ---- Personally speaking, there is nothing happier than reading a book, _______ a cup of coffee.
---I think we should eat some fresh fruit every day. --- __________ . An apple a day keeps the doctor away.
Mrs. Black doesn’t believe her son is able to design a digital camera, __________ ?