the trees in that thick forest are so dose together that there is hardly any room to move them.
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.