They considered ___ a computer, which was considered ___ a great help in their work.

---Tom, keep your_____ on your studies. --- Sure, mum. I'll keep that in_____.

Hand in hand with reading, Dave ____ the habit of making notes.

On April 24, Tsinghua University         its 100th anniversary at the Great Hall of the People in Beijing. 

With so much noise of the traffic, I couldn’t ______ and do my research work．