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21. The students spent three hours correcting their exercises.
It took
22. She is no longer late for class.
She used
23. I hate getting up early every morning.
I wish
24. Because she is very intelligent, she can pass the exam easily.
She is such
25. Her family is very poor, so they don't have enough food to eat.
Her family is so
26. Please don't interrupt me all the time.
Would you mind
27. In spite of the bad weather, we're going to have a picnic.
Although
28. The river is too dirty for us to swim in.
The river
29. How long have you lived in this city?
When
30. My father began giving up smoking last year.
My father has