1 . Recently it has been noticed _____ an increasing number of students are bringing smartphones to school, _____ means using smartphones reasonably has become _____ unavoidable topic for us students.

A．/; that; a

B．that; which; an

C．/; which; an

D．that; which; the

2 . Dubai was a 6, 000-person fishing village half a century ago. But now ______ attract tourists to Dubai are tax-free shopping, excellent hotels, delicious food and beaches.

A．it

B．that

C．which

D．what

3 . ______ that the stone bridge has been standing there for over 2000 years.

A．It is amazing	B．That is amazing
C．Which is amazing	D．What is amazing

4 . ________ you can recover soon is the best news I've heard recently.

A．That

B．What

C．Whether

D．When