________ his work in physics, Einstein spent much time working for human rights and progress.

[　　]

There is nothing ________ a letter in the box.

[　　]

Please say “hello” to your parents ________ me.

[　　]

______ I ask your name, please?

[　　]

Those who haven't known hunger can never imagine how it ________.

[　　]

These shoes are too tight. Do you have larger ________ ?

[　　]

My father's ________ is grey, but my mother has a few grey ________.

[　　]

The old woman's ________ often quarrel about housework.

[　　]

Mr Smith will return to Britain tomorrow. I'm going to ________.

[　　]

This is the reason ________ his coming late.

[　　]