To be an astronaut, you must not only be strong in mind, but also be sound mentally and___.
Proper exercise is good for your health._____, too much is bad for it.
The local people are now________ Hong Kong, which was once ________the British for one and half a century.
Nathalie suggested the problem worth paying attention ______ at the meeting.
Someone knocked at your door just now,but I didn’t see who was.
On this important feast day, people eat food in the ______ of skulls and cakes with “bones” on them.