Many old people in the cities find themselves unable to get used to the rapid （）of city life.

单项选择题The issue （）at the conference is very important and it will create a sensation nationwide.

A．discussed
B．being discussed
C．is being discussed
D．has been discussed

单项选择题The captain of the ship （）the passengers that there was no danger.

A．assured
B．ensured
C．secured
D．insured

单项选择题Shortage of capital is the main factor that（）economic development.

A．holds out
B．holds on to
C．holds back
D．holds on

单项选择题The new currency will get into （）soon.

A．circuit
B．circulation
C．circular
D．circle