This novel is set in the modern city, San Francisco, so once _______, it will be very popular.
| A．publishes | B．having published |
| C．published | D．publishing |
what you're doing today important, because you're trading a day of your life for it
| A． | Make | B． | To make | C． | Making | D． | Made |
Only when you can find peace in your heart _____good relationships with others.
| A．will you keep | B．you will keep | C．you kept | D．did you keep |
Since the time humankind started gardening, we _____to make our environment more beautiful.
| A．try | B．have been trying |
| C．are trying | D．will try |
There is no greater pleasure than lying on my back in the middle of the grassland, _____at the night sky.
| A．to stare | B．staring | C．stared | D．having stared |
You will never gain success________ you are fully devoted to your work.
| A．when | B．because | C．after | D．unless |