46.  Nam speaks English better than his sister ( AS)
=> Nam's sister doesn't speak E as well as him
48. It was such a cold day the we stayed indoors ( SO)
=> The day was so cold that we stayed indoors
49. Unless he phones immediately, he won't get any information ( IF)
=> If he phones immediately, he get any information

50. Many students in the USA participted in different activities at recess ( TOOK)
=>Many students in the USA took part in different activities at recess