There has to ______ a well-developed system that can give people a warning when a tsunami is ______ the way.
— Hi, John! I’m going to Greece for my holiday.— Greece? A splendid country, ______ well worth visiting.
— The government requires that every primary school student do sports for at least one hour every day.— _____. It is high time that students took exercise in order to build a strong body.
—Have you ever seen two leaves that are exactly the same?—Never. Leaves differ ____ each other ____ size and shape.
The only system I know ____ will help you remember what you have heard at a lecture is the system of keeping notes.
What difficulty will you have ____ people when you stay in a foreign country?