． Knowledge of English is a must in international trade.
| A．the | B．/ | C．A | D．An |
All her time __________ experiments, so she has no time for films.
| A．devoted to do | B．devoted to doing | C．is devoting to doing | D．is devoted to doing |
You must have missed the first train yesterday, ________ you?
| A．weren’t | B．didn’t | C．mustn’t | D．haven’t |
Professor White, along with his wife and children, ________ London for Paris tomorrow.
| A．are leaving | B．is leaving | C．has left | D．have left |
—He is the only one of the students ______from the country in my class, and we have known for quite some time.
—Where did you meet for the first time?
—It was on the farm ________ I used to work.
| A．who are; that | B．who is; where | C．that is; that | D．whom are; on which |
Working there is ________unforgettable experience because I gained a lot of _______.
| A．a; experience | B．an; experience | C．/; experiences | D．/; experience |