9. ........ swam very fast
10 ....... we keep our environment clean, we will live happier and healthier
11 ....... don't we looking for an alternative fuel?
12. ... half an hour a day to clean the floor
13 ........ we play football too much, we will be tired
14 ........ having a sore throat, I speak very softly today
15 ........ you don't hurry up, you will not catch the first bus









