Don’t handle the vase as if it ____ made of steel.
My brother can ride a horse and swim, and he can shoot _______.
Why didn’t you ask for help, ______ trying to do it on your own?
The book is _______ that one.
The name of our country is PRC, which _____ the People’s Republic of China.
He came back late, _____ which time all the guesses had already left.