21. It is said that ____wool produced in Inner Mongolia is of ____high quality.
A. / ;/ B. the;/ C. the; a D. the ; the
22. —Life _____ be very hard for people living in the north of Heilongjiang Province as it is very cold there in the winter.
—Yes, the weather there _____ be as low as 40℃ below zero.
A．must; can B．shall; must C．will; should D．has to; can
