Yao Ming as well as his teammates ________ hard to win honor for China these years.
| A．work | B．are working | C．has been working | D．works |
After his long journey from Australia. Tom returned home, ____.
| A．exhausting | B．exhausted | C．being exhausted | D．having exhausted |
It is partly ______ the summer day is longer that everything has a larger time to warm up.
| A．for | B．that | C．the reason | D．because |
—May I go outside and play for a while, Dad?
—No, you can’t ____ your homework is being done.
| A．until | B．as | C．before | D．the moment |
_____ I heard his voice trembling did I realize what trouble he was in.
| A．Only when | B．Until when | C．No sooner had | D．Hardly had |
—Don’t always answer me with a simple “Yes” or “No”. Explain ______possible.
—OK. I’ll try my best.
| A．whatever | B．whenever | C．however | D．whoever |