1.Complete the sentences:
a.He ___ (wait)for half an howr before they ____ (arrive).
b.Where ___(he/go) when you ___(see) him?
c.He __(phone ) me to say they would be late.
d.She ___(talk)to John on the phone when I ___(walk)in .
e._____(she/know) they___ (come) to the party ?