Choose the best answer

Mọi người ơi giúp mình với ạ
1.When you see John,  remenber.... It by the window and now it has gone. 
a. To have given
b.  Giving
c.  Give
d.  To give 
2. Someone must have taken my bad. I clearly remember... It by the window and now it has gone. 
A.  Leave
B. Leaving
C. To leave
D. To have left