1. Some of these stars are （亮一亿倍）than the sun.

　　2. The grain output （增加了三倍）.

　　3. The sun is （33万倍大）as the earth.

　　4. This year we have produced （相当于…两倍）computers as last year.

　　5. This house is （大四倍）as that one.

　　6. This river is （比…宽一倍）of that one.