The policeman is still not sure ______ the young man killed himself or was killed.
| A．if | B．that | C．whether | D．weather |
My English teacher ________ Mrs Lane now. She often helps me.
| A．were | B．will be | C．is | D．was |
—________ 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 |