II. 语法填空：(10×2)
People can call 911 when they need help. The police   1  (come) quickly. This phone number should be used only   2  an emergency.  3 there have been some problems with people using the 911 phone number. More than half of the calls made to it are an accident. These accidental calls are not real emergencies.
Calling 911 when you do not need  4  can be very bad. It wastes the time of the people answering the calls. It can even force someone  5  has a real emergency to wait before getting the help they need.
Many accidental 911 calls come from cellphones. Sometimes keys on the phones  6  (push) and  the call goes through without the owner of the phone  7  (know) that he has called an emergency number. People are trying to find a way to solve this problem.
They are testing  8  new program that might help solve the problem of accidental 911 calls. This program will make  9  (call) of 911 push another key on the phone  10  it is a real emergency. People hope that this change will reduce the number of accidental 911 calls going through.