—How was your trip to Hangzhou，Jim?
—Great! We ________to Xixi National Wetland Park.
| A．go | B．am going |
| C．will go | D．went |
—Where were you at 7：00 last night?
—I________ to my mom at home.
A．write
B．was writing
C．wrote
If it had been fine yesterday，we could have watched that air show. But it ________all day.
| A．has rained | B．had rained |
| C．rained | D．rains |
Yesterday evening，I ________along the street when I suddenly met my maths teacher.
| A．walk | B．walked |
| C．was walking | D．am walking |
The population of the world ________still ________now.
| A．will；grow | B．has；grown |
| C．is；growing | D．is；grown |