--- How I wish I had studied harder when I was in senior school! --- If you had, you a university student now.
The little girl was unhappy_________her picture-book broken.
.—Are my clothes too casual? —No. You can go_________you are.
Please turn down the music, _________our neighbors next door will be disturbed.
In summer, food will go bad if_________in room temperature.
.QQ, _________you can chat with your friends, makes communication easy.