It was a time_______ the killer whales helped the whalers catch the baleen whales.
Getting off the bus, she found her hand bag ________.
It's necessary that measures _____ at once to help people understand global warming is affecting our life to an increasingly high degree.
You' d sound a lot more polite if you make a request ______ a question.
Alone in the garden sat the girl, thinking, for a long time, of _______ life was like with her teachers and classmates in the past.
To ______ good relationships with your teachers and classmates, you should learn to share ups and downs with them.