Hold on to your dreams, _______ they will come true one day.
| A．but | B．and |
| C．so | D．or |
His pronunciation is better, for he kept ______ a short passage after the tape every morning.
| A．to read | B．reading | C．read | D．reads |
Run for more than half an hour every day, ________ you can lose your weight easily.
| A．or | B．and | C．but | D．unless |
Mr. Zhang ________ as an engineer since he came to the computer company in 2008.
| A．works | B．worked | C．has worked | D．had worked |
Listen! Who _____ the piano in the next room?
| A．plays | B．played | C．is playing | D．has played |
The students were excited when they knew they ______ out for a spring out the next month.
| A．went | B．had gone | C．will go | D．would go |