用下列单词的正确形式填空,

用下列单词的正确形式填空,
13 My elder sister enjoys__table tennis.(play)
14 I don’t know how__a bicycle (ride)
15 Before Jim eats something,he always brushes his__first.(tooth)
16 My parents take me to visit my grandparents__a month .(one)
17 These is a short introduction at the __of every unit.(begin)
18 Every schoolday,we have __both in the morning and in the afternoon.(class)
19 We have a lot of class____to do in class .(activity)
20 Tom is lazy.He__ complete his homework on time every day.(do)
21 Look!There __some milk in the bottle.(be)
22 Let me ___you mend your bike.(help)
23 Loys of people still burn wood ___energy.(make)
24 You must stop__in the busy street.It’s dangerous.(play)
25 The young man wants two___of water.(glass)