The most crowded part in a city is usually the city center, ______ many shopping malls and office buildings.
| A．which lie | B．which lies |
| C．where lie | D．where lies |
Cucumber contains a high content of vitamin C which is five times higher than _____of watermelon.
| A． ones | B．it | C． that | D．those |
Population experts say that by 2050 the world will have about 2 billion people aged over 60,____as today.
| A．as three times | B． three times as many |
| C． three times many | D． three times many as |
In remote mountainous villages in China, it is not ______ to find families with men wearing thick moustache, shabby clothes and worn shoes, chewing tobaccos and with porridge as their main daily food.
| A．rare | B．seldom | C．ordinary | D．hardly |
In an amusement park you can ______yourself with a variety of facilities, ranging from trolley buses to roller coasters.
| A．receive | B．treat | C．amuse | D．happy |
She _____ what had happened in a low voice for fear ________ she said might be overheard by others
| A．told; what | B．whispered to me ; that what |
| C．said to me ; what | D．told me; that what |