The teacher told us _____ to the recorder and read the dialogue three times.
| A．listen | B．listened | C．listening | D．to listen |
Although they were tired, they still went on _____.
| A．working | B．to work | C．work | D．worked |
_____ you tell me how to use this digital dictionary?
| A．May | B．Must | C．Can | D．Need |
We _____ more than 1,200 English words already, do you know?
| A．learn | B．will learn | C．have learned | D．are learning |
I went to Sanya with my family this summer and all of us _____ a good trip.
| A．have | B．are having | C．will have | D．had |