It was not until the subprime loan crisis(次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.
---Mum,the soup is too salty.You ______ a lot of salt in it. ---Oh,dear! I put much salt instead of sugar in it.
.---Let's go to the seaside for fresh air,OK? ---_______.
.Many parents think it will be of great use for their children to ______ from home and earn their own living.
Color - blind people often find it difficult to ______ between red and green.
Those two countries are similar ______ they both have heavy snowfalls during the winter.