Bill suggested _____ a meeting on what to do for the Shanghai Expoduring the vacation

The number of people invited ____fifty, but a number of them _____absent for different reasons.

It worries him a lot that ______ little money he earns in the company can hardly support so large ______ family.

I wonder how much for your services—-The first two are freethe third one costs $30

Not only his students to know more about modern science,but hard to develop a curiosity about nature among them.