—Would you like to come to dinner tonight?—I’d like to, ___ I’m too busy.

___ impressed me most about the woman was that she looked after the old man for twenty years without any complaint.

We should do what we have to do________ we can do what we want to do in the future.

—I rang you at about nine，but there was no reply．—Oh，that was probably        I was seeing the doctor．

We’d better stay here a little longer    he turns up unexpectedly.