一、填空题
1.No matter how hard I try I cannot seem __________(catch) up on all the bills.
2.In order to reduce the costs of the products, we are alwaysseeking __________(improve) productivity.
3.The Pacific is so large,__________(cover) about 30%of the planet's surface.
4.________(frighten) by the noise outside, the little girl dare not sleep alone in the bedroom.
5.An hour passed before she came __________(run) back, almost too breathless to speak.
