MRP值与MR值，MFC值与MC值是分别相等的。（)

We had to wait a long time to get our passports, __________？

A. won't we B. don't we C. didn't we D. shouldn't you

But change won’t happen if we ______ and let other people do the dirty work.

Aset up

Bsit down

Csit back

Dset down

We won't be able to go to the club ______ our parents give us permission.

A．although

B．nevertheless

C．unless

D．once

We won't allow any foreign country to _______ in our internal affairs.

A、devote

B、district

C、interfere

D、wander

We have to ______ our homework right now, or we won't finish it today.

A．go for

B．go out

C．go about

D．go in

oing to underperform. because we won't be totally in stocks." We know from this sentence all of the following EXCEPT that______.

A．the 1990s saw a booming stock market

B．We underperformed during the 1990s

C．We are not totally in stocks

D．We will change our course of action

She won't contact you, ______ something unforeseen happens.

A．as

B．since

C．though

D．unless