1 . Mom used only half of the money, the rest of which ______ saved for other purposes.

A．is

B．are

C．was

D．were

2 . Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are usually -20 ⁰C, to the border with the USA in the south, _______ is said to be the longest border in the world not defended.

A．which, where

B．whose, which

C．where, where

D．where, which

3 . The one concern for parents and students is ______ if the student pursues their university education in a foreign country, the student will not have the opportunity to establish social contacts in China.

A．what

B．that

C．whether

D．/

4 . Three-fourths of the homework _______today.

A．has finished	B．has been finished
C．have finished	D．have been finished