____ he works hard, I don’t mind when he finishes the experiment

The two sisters are_______ different in character — one talks a lot while the other is a girl of few words.

In April, 2009, President Hu inspected the warships in Qingdao, _____the 60th anniversary of the founding of the PLA Navy. [ ]

You read a book in the sun—it’ll do harm to your eyes.

Once e-mail learners _______ with the basic knowledge of how to use the network, they ______ to a local network and a global network