I think the answer is right but I’m not ____ sure about it.
The air force of that country is _____ the command of General Hall.
My English teacher advised I _____ keep my mouth shut to improve my spoken English.
The manager told her _____ to post the letters by 3:00 in the afternoon.
Bring the flowers into a warm room _____ they’ll soon open.
Our teachers always tell us to believe in _____ we do and who we are if we want to succeed.