—______do you write to your parents?
-- Twice a month.
| A．How often | B．How many |
| C．How long | D．How soon |
A boy with two dogs ______when the earthquake rocked the city.
| A．were sleeping | B．is asleep | C．was sleeping | D．are asleep |
—_____you ever _____to the hometown of Hao(郝氏故里)?
—Yes, twice.
| A．Have, gone | B．Have, been | C．Do, go | D．were going |
In the past ten years, our hometown named Yandu（盐都） _____a lot.
| A． changes | B．changed | C．was changing | D．has changed |
If there ______no buying and selling of animals, there ______no killing in nature.
| A．is, will be | B．will be, will be | C．is, is | D．will be, is |
Many accidents_____ by careless drivers last year.
| A．are caused | B．were caused | C．have caused | D．will cause |