" Harry was compelled to resign and to come down to London, when he set up as an army coach（定从）." The relative clause in the sentence serves to _________________.

The tape recorder ______ out of order, the students did not know what to do.

At three o＇clock this morning, I seemed ______ someone scream in the street.

That is the robber ______ arrest a reward was offered.

I want an assistant with ______ knowledge of French and ______ experience in handling office routine.

On no account ______ borrow money from friends,and still less ______ dependent on the favours of rich relatives.

"Did you hear of his death?"
"Yes. If he ______ in time, he ______."

We are thinking of going ______ holiday to Switzerland.

Mr. Brown had the report ______ as soon as he finished ______ it.

The mother was afraid to let the boy ______ the tree.

They ______ a tip if the service is poor.