5.what about going out for a change?
6.if Peter prepared his lesson well,he could not get bad marks
8.Mary plays tennis very well
7.if you work so much,you will be tired
9.as this question is so difficult,nobody can answer it
10.because of the heavy rain,they decided not to go out last night
11.because nga was ill,she didn't go to school
12.i suggest turning on the TV the TV to...forecast
14.if Ha want to get lots of money,she must work harder