سلام عليكم الاجوبة اللي اعرفها :
1) in
2) have
3) does
4)in
5) ask
6) happens
7) scientists
8) we sleep to repair our bodies
9) these are
10) how far
11) the better
12) din't have
13)few
14) are usually
15) were going
16) more expensive than
17)leave it blank
18)at
19)hats
20) easy