Mr. Zhang ________ as an engineer since he came to the computer company in 2008.
| A．works | B．worked | C．has worked | D．had worked |
--Is that Anna's car?
--It____be hers. She has just gone to the theater for the new opera.
| A．can't | B．mustn't | C．may | D．could |
Following the traffic rules can help us____ accidents.
| A．influence | B．repeat | C．produce | D．avoid |
Nowadays Wechat is____used by people for communicating, sharing, chatting, and so on.
| A．lastly | B．exactly | C．widely | D．nearly |
All the teachers love Mary. She is veryin answering teachers' questions in class.
| A．polite | B．direct | C．active | D．lively |
Those who would like to help others always have more chances to help____．
| A．them | B．themselves | C．us | D．ourselves |