___________Mrs Smith worked day and night, he found it difficult to make enough money to support such a large family.
A．Since B．If C．Once D．Although
___________ with the size of the whole earth, the biggest ocean does not seem big at all.
A．Compare B．Comparing C．When compared D．When comparing
The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
A．when B．while C．unless D．until
the teacher us, we can make great progress.
A．With; to lead B．With; lead C．As; lead D．As; leading
The young man tried to live by writing, but it didn’t provide a good enough ___________.
A．money B．value C．bill D．income
China is a _____ country _____ to the third world.
A．developed; belongs B．developing; belonging
C．developing; belonged D．developed; belonged
