This is John’s photo. We miss him very much. He ________ trying to save a girl in the earthquake.
—Alice promised me to come round to keep you company today. —But she ________. I've been alone all day.
It is impossible to cooperate with a person ________ methods are completely opposed to your own.
Butterflies ________ a sweet liquid produced by flowers, which bees and other insects collect.
The girl in the photo was smiling sweetly, ________.
Electronic products are ________ must for new generation of ________ college students.