Most students exercise __________ a week.
| A．once or twice | B．one time or two time |
| C．once time or twice | D．once or two time |
They ____________ in the river when it __________ to rain.
| A．were swimming; began |
| B．swam; was beginning |
| C．swam; began |
| D．were swimming; was beginning |
Please knock at the door ________ you come into the room.
| A．before | B．after | C．until | D．while |
– Where is Jenny now?
-- She _____________ in the garden.
| A．works | B．is working |
| C．work | D．worked |
– Daming, where are you going?
-- Don’t worry, mum. I _______________ in ten minutes.
| A．come back | B．have come back |
| C．will come back | D．coming back |
– Would you like __________ with me?
-- Yes, I’d love to.
| A．going | B．to go | C．goes | D．went |