1.he has no longer been writing to his friends ever since he got a mobile.
2.even though he is very busy ,he spend at least two hours every day surfing the internet in order to find out /learn about the latest developments in this field .
3. Professor li gave a short speech at the commencement .his word were /what he said was strongly impressed upon my memory.
4.talking of the final exams the student were not nervous at all .there is full confidence on everyone's face .
5. to write a short passage of about 100 words in 30minutes would be a snap to most students in their class.