This poor boy was treated so ___ by his stepmother that we all helped him.

If a person takes drugs, they will slow down his thinking and ________ turn off his brain. 

 We used to see each other ________，but I haven't heard from him since last year.(2012·辽宁)

The test not only helps make our _____ acquired knowledge permanent, but also enables us to find out what needs to take more time to improve.

If you are invited to any special occasion such as a wedding or a celebration, you’ll have to be ____ dressed.