Steps must be taken ______this kind of disaster will never happen again．
A．because B．even if C．as D．so that
Please keep me informed_______ the change of your address as soon as possible．
A．of B．for C．with D．by
One of the most important questions they had to consider was _____of public health．
A．what B．this C．that D．which
The lady walked around the shops,______ an eye out for bargains．
A．keep B．kept C．keeping D．to keep
I go _____to the stadium when there’s a game．But usually I watch it on TV．
A．typically B．anxiously C．frequently D．occasionally
—Can you give some advice on what I said just now?
---Sorry．My mind ______．
A．is wandering B．was wandering
C．has wandered D．had wandered
