Since the time humankind started gardening, we _____to make our environment more beautiful.
–Do you know _______? --- Someone wants to find his dog back.
– Have they found out the _____ of the fire? -- Yes. It was a cigarette end that _____ the fire.
She did not take the advice that she ___ at rush hour, so she got lost.
In the last ten years she _____ like this; she is killing her health. A. works b. has been working C. worked D. is working
The policemen are searching for the ____car on the highway.