动词填空（写出所给的动词的适当形式）（共5小题；每小题1分，满分5分）
Before you give up the job, _________(consider) how your family will think about it .
We usually shake hands and say “How do you do?” when first ____(introduce) to each other.
With so many difficult problems ________(settle), the new headmaster had a hard time then.
___________ (observe) the problem for many years, he announced that we are now facing the biggest environmental problem of our time.
____________ (examine) twice a year , whether it is a car or a bus or a truck, is the rule that every driver shall obey in this city.