Someone who lacks staying power and perseverance is unlikely to _________ a good researcher．

       A．make     B．turn       C．get        D．grow

Although the causes of cancer ________, we do not yet have any practical way to prevent it．

       A．have uncovered             B．have been uncovering  

       C．are uncovering        D．are being uncovered

________ this cake, you'll need 2 eggs, 175 g sugar and 175 g flour．

A．Having made   B．Make          C．To make       D．Making

After the earthquake, the first thing the local government did was to provide           for the homeless families．

       A．accommodation      B．occupation       C．equipment       D．furniture．

The rescue workers were working around the clock, ________ supplies to Yushu Qinghai Province after the earthquake．

       A．to send     B．sending     C．having sent      D．to have sent

So difficult           it to work out the problem that I decided to ask Tom for advice．

     A．I did find      B．I have found         C．did I find      D．have I found

—What's the name?

— Khulaifi．_______ I spell that for you?

A．Shall       B．Would     C．Can D．Might

I’d appreciate _________ if you would like to teach me how to use the computer．

       A．that        B．it   C．this        D．you

Letterboxes are much more ________ in the UK than in the US, where most people have a mailbox instead．

       A．common   B．normal     C．ordinary   D．usual

A clean environment can help the city bid for the Olympics, which ________ will promote its economic development．

       A．in nature       B．in return        C．in turn   D．in fact