Nowadays new taxi apps（打车软件）__ to help people travel around more easily.
| A．are used | B．use | C．used | D．is used |
Mr. and Mrs. Wang __dinner when the light in the kitchen went out suddenly.
| A． had | B．are having |
| C．were having | D．will have |
“Red envelope” fever on WeChat__ the country since January 26, 2015.
| A．swept | B．has swept | C．sweeps | D．will sweep |
People in other countries are becoming more interested in . __Chinese characters.
| A．learned | B．to learn | C．learn | D．learning |
Lee Kuan Yew encouraged Singaporeans to smile and speak good English, __ he?
| A．didn't | B．did | C．doesn't | D．does |