While I _____ my homework in my room, my mother _____ in the kitchen.
| A．did; cooked | B．was doing; cooked |
| C．did; was cooking | D．was doing; was cooking |
Thanks to the computers, we do not have to spend a lot of time ________ boring numbers
and information.
| A．processing | B．to process | C．processed | D．process |
A lot of supermarkets ________ in our city three years ago.
| A．built | B．build | C．are built | D．were built |
— In our city, people always see the blue sky this year. What do you think of it?
— I think trees we plant, air our city will have.
| A．the less; the cleaner | B．the most; the cleanest |
| C．the more; the cleaner | D．the least; the cleanest |
______ are these bright purple shirts in front of the window made of?
| A．Where | B．When | C．What | D．How |
She asked two persons the way to the bank, but of them could help her.
| A．both | B．neither | C．either | D．all |