____ several times, the young scientist still kept on doing his experiments.
I am very grateful to my high school teachers, without ______ help I wouldn’t be so excellent.
The pop star walked out of the stage, ______ her hands elegantly to her crazy fans.
The group of the aged are close companions, and many of ______ have known each other for decades.
We are so happy to see that some of the students have already learned enough English to ______ a conversation.
Amy joined a painting group but didn’t seem to ______, so she left.