28c The effect of information technology on education.

29b once or twice

30c Computer software

31a Design materials for the students

32d Students' learning time won't be monitored.

II.33 john suggested that barbara should put better lock on the door

34 despite his both broken legs he managed to get out of the car before it exploded

35 this is the first time I have eaten this kind of fodd

36 plans for an extension to the house have been drawn by the architect

37 You don't have to finish by Saturday.

38 The journalist wanted to know how many survivors there were.

39 the meat was so rotten that it had to be thrown away

40  Professor john lee must be met at the airport