I wrote him a letter to show my ________ of his thoughtfulness．

A．achievement

B．agreement

C．attention

D．appreciation

We all know that ________ speak louder than words．

A．movements

B．performances

C．operations

D．actions

Many scholars and experts from all over the world will be invited to attend this yearly ________ on drug control．

A．reference

B．intention

C．conference

D．interaction

Julie wants to buy a ________ computer so that she can carry it around when she travels．

A．memorable

B．portable

C．predictable

D．readable

The fire in the fireworks factory in Changhua set off a series of powerful ________ and killed four people．

A．explosions

B．extensions

C．inspections

D．impressions

Although he is a chef, Roberto ________ cooks his own meals．

A．rarely

B．bitterly

C．naturally

D．skillfully

At times, worrying is a normal, ________ response to a difficult event or situation－a loved one being injured in an accident, for example．

A．effective

B．individual

C．inevitable

D．unfavorable

Everyone should be able to do ________ they can to make their company bigger．

A．what

B．that

C．where

D．how

The other day, my brother drove his car down the street at ________ I thought was a dangerous speed．

A．as

B．which

C．what

D．that

There is no doubt ________ John’s quick thinking and the first aid skills saved Mr Slade’s life．

A．that

B．what

C．whether

D．if