1 . 选词填空

have an effect on, from time to time, focus on, at sb.'s expense, be hard-wired into, for example

1. Why did Smith have a good laugh ________ his wife's ________?
2. The researchers have tested that the response may ________ the brain.
3. ________ your attention and you will achieve success.
4. English learning consists of different ways, ________, communicating with foreigners is one of the effective ways.
5. ________, we have to think twice when we are in a tough situation.
6. Does television ________ children's behaviour?