Please write a letter to Keith Brown， the Purchasing Manager of ANA Enterprises. Their address is, 100 George Street, Sydney, NSW, Australia, 1.（）. Tell them that we have agreed to a 4% reduction 2.（）that we originally quoted them for the supply of. 3.（）. The same 4.（） still apply. And the reference number on their letter is 03/5879. The letter is dated 1st February this year. Have our reply ready for me to sign 5. （）, please.

第一个空应填入（）

单项选择题They recommended （）smaller heating and cooling systems.

A．to use
B．to be used
C．being used
D．using

单项选择题（）the book again, she discovered that she had missed a lot in her first reading.

A．While reading
B．When read
C．As reading
D．In reading

单项选择题This is one of the foods that my doctor has forbidden me （）.

A．eating
B．to eat
C．eat
D．to be eaten

单项选择题（） the baby fell asleep （）the room.

A．After; did the mother leave
B．Not until; did the mother leave
C．When; did the mother leave
D．Until; did the mother leave

单项选择题（）scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

A．As
B．While
C．For
D．Since