________ did I realize I was mistaken，but it was too late．

A．Not only

B．If only

C．Only when

D．Only then

I told your sister to work harder， and that ________ you， too．

A．fits for

B．suits to

C．goes for

D．does with

It's nearly seven o'clock．Mike ________ be here at any moment．

A．must

B．need

C．should

D．had better

The boy was late．He tried to enter the classroom without being noticed by the teacher， but luck ________ him．

A．went with

B．went against

C．went along

D．went over

The famous singer gave the clothes away but ________ the necklace．

A．hold

B．kept

C．took

D．chose

The couple have a lot in ________ with each other．

A．common

B．ordinary

C．usual

D．general

She can hardly ________ how much she will be obliged to them．

A．tell

B．speak

C．express

D．explain

Many countries are increasing their use of natural gas，wind and other forms of________．

A．energy

B．source

C．power

D．material

—Thanks for your help，but can you do me more favor，please？

—________，sir．What's it then？

A．Just a minute

B．It's nice of you

C．That's all right

D．At your service

He is obviously ________ good health．

A．at

B．on

C．in

D．of