11.  In my opinion, I think the two-days weekend is good, it can help me to finish the homework and the housework, it can give me to have a rest, it can make me do a lot of things .

12.  Please bring a picnic lunch and drink.Wear sport shoes as we shall do a lot of walking.

13.  Wear sports shoes as we shall do a lot of walking.

14.  Wear sports shoes as we shall do a lot of walking.

15.  Wear sport shoes as we will do a lot of walking.

16.  This summer vacation did a lot of thing.

17.  Wear sport shoes as we shall do a lot of walking.

18.  For example, in English study, if we want to speak English fluently, we must do a lot of practice about listening, speaking, reading and writing.

19.  We can find many ways to do a problem after doing lots of exercises.

20.  If you want to improve your comprehensive abilities, you must do a lot of exercises.