Although you may meet some difficuIties,you should never .
—I saw Mr Smith in the office at ten yesterday morning.—That’s impossible.He________an English party with us then.
________I was in the US,I made a lot of American friends.
—I don’t know________.—Because he has to look after his mother.
She________to an English program while her parents________TV.
—I didn’t see you at the beginning of the party last night.—I________on nay biology report at that time.