I asked my boss for a month’s holiday and, _____, she agreed.

A．what’s more

B．that is to say

C．believe it or not

D．in other words

Don’t turn off the computer before closing all programs, _________ you could have problems.

A．or

B．and

C．but

D．so

They are talking _____ they had been friends for years, while in fact they have known each other for only two hours.

A．even though

B．as though

C．now that

D．until

--- This is the same watch ______ I left on the playground yesterday.  
--- How can it be possible? I bought _____ the other day.

A．that; one

B．that; it

C．as; one

D．as; that

_____ the majority of people you will meet when travelling are sure to be friendly, there are dangers-theft being the most common.

A．Since

B．Unless

C．While

D．Once

We know _____America is great not because it is perfect but because it can always be made better and _____ the unfinished work of perfecting the union falls to each of its citizens.

A．不填；不填

B．that ; that

C．that ; 不填

D．不填；which

In case of fire, stay low to the ground in a smoky room, ________ smoke always rises towards the ceiling.

A．as

B．when

C．while

D．once

________ the global economy is showing signs of recovery, many developing countries are still suffering.

A．As

B．Where

C．How

D．While

Some people are holding their umbrellas ____ it is raining.

A．in case

B．so that

C．as though

D．unless

He found it impossible to please his boss; ____, he quit the well-paid job.

A．however

B．even so

C．otherwise

D．thus