1.The word when can _____ ______ _____ (代替) at the same time.
2.They were _____ ______ _____(从……当中出来)of a spaceship.
3.______ ______ (既然)I have made this first visit, I hope I can come many more.
4.Could I possibly ______ __________ __________(把你的名字签在……) on my arm?
