The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
When he was a child, he ______ watch TV whenever he wanted to.
Professor John will give us a lecture on how to learn English, but when and where _____ yet.
Having taken our seats, _______.
Do you think the reason _______ he gave is believable?
Thank you for your timely help, otherwise we _______ in great trouble now.