It's the second time that I __________ in Shanghai ！ What great changes have taken place in Shang Hai. It is ten years since I __________ it last time.
| A．have been ； left |
| B．had been ； left |
| C．have been ；had left |
| D．went ；had left |
— There is growing _____ about house prices.
— Don’t worry! Something has been done.
| A．power | B．item | C．series | D．concern |
Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
| A．it; what | B．what; what | C．what; it | D．it; it |
One can ______ BBC _____ the air early with his Short-wave radio.
| A．pick up; on | B．pick out; over | C．pick up; through | D．pick up; by |
— How many teachers are party members in your school?
— Party members_________ one fifth of the number of the teachers in our school.
| A．take up | B．set up | C．make up | D．fix up |
Jim was born on a farm, _____, he knows little about farming.
| A．thus | B．and | C．yet | D．otherwise |