6.The beggar was sitting in the busiest part of the city.

28.He has taught English in this university ever since he moved to this city.

27.I expect she will have changed her mind by tomorrow.

26.You'll find in English some words can be remembered more easily than the others.

25.

24.

23.

22.

21.

20.I fell and hurt myself while I ________ basketball yesterday.

19.The higher the temperature, _____the liquid evaporates.