Small cars are useful in cities with narrow __________．（　　）

There will be fewer workers in factories because most work _________ by robots in the future．（　　）

He ______look at the stars every night， but now he does not．（　　）

Luke's mother will be _____him if he wins the reading competition．（　　）

_______do you brush your teeth？

Twice or more a day．（　　）