1.--Do you know Taiwan, Jenny?
--Yes, of course. Taiwan is _____ island. It belongs to China.
A．a B．an C．the D．不填
2. He often helps the students ____________ are not so good at English.
A. who B. whom C. whose D. they
3. Friends should always be ___________ about each other’s feelings.
A. crazy B. hidden C. concerned D. worried
