英语,急!~~~~~~~~~

1.Half the world's telephone calls are made with(改成in) Eglish.
（in English译为‘用英语说’）
2.He's one of the world's most important doctor（加s）.
（‘所有医生中的其中一位’，用复数形式；但如果是the only one of......,则用单数，译为‘唯一的一位’）
3. They want to know when the next meeting will start.
（宾语从句用陈述句语序）
4.At 6 o'clock I was doing something else.
（用过去进行时‘过去那一时刻正在进行的事’）

with 改 by (Eglish?)
doctor 改 doctors
the next meeting will start
At 6 o'clock I was doing something else

Half the world's telephone calls are made with(改成in) Eglish.

He's one of the world's most important doctor（加s）.

They want to know when the next meeting will（will移动到此处） start.

At 6 o'clock I was to do（to do改成doing） something else.

Half the world's telephone calls are made of Eglish.

He's one of the world's most important doctors. （one of结构注意用复数）

They want to know when the next mee