There are many valuable services which the public are willing to pay ___, but which __ not bring a return in money to the community.
They were so late that they ____had time to catch the train.
----Why can’t I smoke here? ----At no time_____in the meeting room.
Helen plays the piano well, ____her favourite instrument is the violin.
The young man, ___two attemps to climb the high mountain, decided to have another try this year.
The boy was caught ____in the examinaton room and was later punished for that.