— Can you come to my birthday party tonight? — I’d love to, but I______ on a patient at 6 o’clock.
. In no other countries ________ so large a proportion of their space to the activities of the movie and football stars.
. From this simple concept ________ that has caused a great change in farming.
�. ________ when she started complaining.
. An awful accident ________, however, occur on the express the other day.
. Was it ________ your son won the first prize last month that please you?