The door is low, so ______ your head when you go in.
Harry has been reading all day---he ______ be tired.
Children have a natural ______ about the world around them. They are interested in everything.
---Must I clean the window now? ---No, you ______.
In order to attract more customers, many supermarkets usually sell their goods at a good ______ at weekends.
---When can I come for the English books? I need them tomorrow afternoon. ---They ______ be ready by half past eleven.