地球上天天都有地震发生，一年约有五百万次，其中能造成破坏的地震约有5000次左右。（）
参考答案：错
We need an effective strategy to help children living in ________ poverty to have the opportunity to receive ________ good education.
A．/；a
B．a；/
C．/；the
D．the；a
It was playing computer games that cost the boy plenty of time that he ______ spent doing his lessons.
A．might have
B．should
C．ought to have
D．could
