The effect of the medicine on this kind of disease remains ________．

A．to be seen

B．seen

C．seeing

D．to see

－Is the White House ________ to ordinary visitors?

－Of course．

A．accessible

B．available

C．reasonable

D．adjustable

One reason that we haven’t had his letter is that he ________ it to our old address by mistake．

A．might send

B．may have sent

C．should send

D．should have sent

Well, if a place is ________ a visit, it is ________ to be visited．

A．worth; worth

B．worth; worthy

C．worthy; worth

D．worthy; worthy

He hung about the entrance all day, ________ a chance to speak to the director．

A．hoping

B．hoping for

C．hoping of

D．hoping to

The child was abandoned in the forest, where he was ________ the mercy of wild beasts．

A．on

B．by

C．in

D．at

I don’t understand the politics：I’m all ________ when people talk about the government．

A．at sea

B．at the sea

C．on sea

D．on the sea

Seven people were reported ________ in the accident．

A．to have been killed

B．having been killed

C．to kill

D．being killed

Luckily, the poor boy had enough money ________ he could buy a train ticket．

A．by which

B．on which

C．with which

D．for which

The Olympic Games ,________in 776 BC, didn’t included women players until 1912．

A．first playing

B．to be first played

C．first played

D．to be first playing