To save class time, our teacher has ___ students do half of the exercises in class and complete the other half for our homework.
The Internet is widely used, which ______ the development of English.
Only when she reached her office____ she had left her key at home.
---The president _____ by his doctor today that his cancer has come back.
_____ by the sun, they walked towards their destination through the woods.
Thompson had two ways, neither of _____ seems to have worked well.