The accident happened ______ a freezing winter morning.
| A．on | B．in | C．at | D．since |
--I saw you came to school by taxi this morning.
--Oh, I_______ come to school by taxi, but it is raining today.
| A．sometimes | B．always | C．hardly | D．usually |
Now one of the hottest topics_______ people are talking about is the safety of food.
| A．that | B．who | C．when | D．which |
---Not only the young but also the old are getting interested _______Wechat.
---They can communicate more freely.
| A．by | B．about | C．in | D．For |
Paper cuttings are put on the doors and windows as a _______ of good luck during the Spring Festival in China.
| A．sign | B．symbol | C．speech | D．spread |
It’s _______ to shake hands without taking off your gloves in many eastern European countries.
| A．supposed | B．expected |
| C．important | D．impolite |