Peter ________ be really difficult at times even though he's a nice person in general．

shall

should

can

must

Diligence is a kind of quality-and that's ________ it takes to do anything well．

how

why

what

that

When Mary brought friends or volunteers to the area where she worked, most of ________ spent the first day sobbing．

they

them

whom

which

________ away from people who try to belittle(轻视)your ambitions．Small people always do that, but the really great make you feel that you, too, can become great．

Kept

Keep

To keep

Keeping

Thanks to the new law to punish drunk drivers more harshly, drunk driving incidents in China ________ sharply over the past twenty months．

have fallen

fell

had fallen

fall

It was decades ago ________ I was in my teens ________ the Chinese government decided to reform the social system．

that：which

when; that

which：that

that; when

Outside the school ________ many civilians, too anxious to know the results of the vote．

stands

standing

stand

is standing

Why don't you bring ________ to your director's attention that you are too ill to go on working?

that

it

this

one

________ many drug users can't erase the past, they can certainly move forward．

While

Unless

If

Once

________ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city．

Examined

Examining

Being examined

Having been examined