1 we (not play) won't well if it rains 2 if my sister(study) studies hard she will pass her exam with excellent results 3 they suggested (speak) speaking english in class more often 4 i'm sure that they (not go) won't go with him 5 what about (collect) collecting unused clothes for them 6 we are excited that our school (hold) is going to hold an english-speaking contest next week 7 i think we should (take) take a shower instead of a bath to save energy 8 raw sewage (pump) is pumped directly into the sea 9 if we go on (litter) litterning the environment will become seriously polluted 10 solar energy can (use) be used on cloudy days 11 the teacher suggested (go) going on a picnic next weekend 12 the boys kept (play) playing volleyball in the stadium although it was raining hard 13 we can reduce garbage by(collect) collecting all waste things for recycling 14 today i'm going to tell you how (save) to save energy in the kitchen 15 he(not come) won't come to your party if you don't invite him