Great changes __ _ since he left his hometown.
| A．have taken place | B．have been taken place |
| C．were taken place | D．took place |
—________ did you start school?
—I started school at five.
| A．How | B．Why | C．When | D．Where |
Robots ________ heavy work on farms in the future.
| A．do | B．will do | C．did | D．does |
Lingling needs some vegetable. She ________ some in the market tomorrow.
| A．buys | B．bought | C．is going to buy | D．buy |
________ stand too close to North Americans. Give them more personal space.
| A．Aren't | B．Didn't | C．Won't | D．Don't |
—________ you play the piano for us?
—Sorry, I can't play the piano, but I can sing for you.
| A．Can | B．Must | C．May | D．Should |