When you are reading，make a note of ________ you think is of great importance.
| A．which | B．that |
| C．what | D．when |
She bought the same skirt at a lower price at the same shop where I bought mine because she was a __________ customer.
| A．common | B．usual |
| C．normal | D．regular |
China is one of the developing countries ________ the third world.
| A．belongs to | B．belonging to |
| C．is belonging to | D．belonged to |
—How long ________ at this job?
—Since 1990.
| A．had you been employed | B．have you been employed |
| C．were you employed | D．will you be employed |
According to today’s newspaper, the escaped prisoner threatened to _____ the police station in the near future.
| A．use up | B．show up | C．blow up | D．call up |
Mary heard ____strange sound at ____midnight outside her house and got scared.
| A．a; / | B．the; / | C．/; the | D．/; a |