Let’s ______my scientific knowledge and your business skills and start a company.

Do you think you can repair this machine withouthelp—— _________. This is not the first time for me to doso.

estimated that the novel will be_____ of his best sellers, for his novels are quite popular among young people．

China is larger than ______ in Africa. (非洲)

We had to stay at home ______ it was raining hard.