1) Force N1 _______________(比力N2大2.5倍).

　　2) This substance _______________(反应速度是另外那种物质的三倍).

　　3) The earth _______________(是月球大小的49倍).

　　4) The landlord _______________(想将租金提高三分之一).

　　5) They _______________(计划将投资增加一倍).

　　一、倍数增减的表示法

　　1) is 2.5 times greater than Force N2

　　2) reacts three times as fast as the other one

　　3) is 49 times the size of the moon

　　4) wants to raise the rent by a third

　　5) plan to double their investment

　　二、时态

　　6) Be quick, _______________(否则等我们到达教堂时婚礼就已经结束了).

　　7) When she got home, _______________(孩子们已经睡着了).

　　8) When I prepare for the college entrance examination, _______________(我姐姐将在海边假).

　　9) I_______________(一上午都在修改我的简历).

　　10) Do you often go on holiday? _______________(不，我已经有五年没有度假了).

　　11) He joined the army in October, 2001. _______________(他参军已五年了).