1 . It is careless _______ such a mistake.

A．of you to make

B．of your making

C．for you to make

D．for your making

2 . It doesn’t matter ________ you pay by cash or credit card in this store.

A．how	B．whether
C．what	D．why

3 . Tom thought it was an honor ___________ to speak in the ceremony.

A．to invite

B．to be invited

C．inviting

D．having invited

4 . _____ is known to us all that the 2012 Olympic Games will take place in London．

A．It

B．Which

C．As

D．What

5 . Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

A．it, it	B．what, what
C．it, what	D．what, it

6 . _____ is commonly believed that the play was written by Shakespeare.

A．It

B．That

C．What

D．As

7 . ____ is our belief that improvements in health care will lead to a stronger, more prosperous economy.

A．As

B．That

C．This

D．It

8 . It has been proved______eating vegetables in childhood helps to protect you against serious illnesses in later life.

A．if

B．because

C．when

D．that

9 . __________turns out that learning English is good for your brain.

A．As

B．What

C．That

D．It

10 .        is not easy to find a best friend in a new place.

A．What

B．Which

C．When

D．It