Plastic bags are provided for our convenience but they have also __________ the pollution of the environment.
| A．referred to |
| B．led to |
| C．reacted to |
| D．attended to |
Shelly had prepared carefully for her biology examination so that she could be sure of passing it at her first.
| A．intention | B．effort | C．attempt | D．sight |
I sent a big bunch of flowers to the nurse as anof thanks for her taking good care of my grandpa in the nursing home.
| A．attitude | B．impression | C．appreciation | D．expression |
Many gases in the atmosphere actually heat energy that escapes from the Earth’s surface back to the earth.
| A．finding; reflecting | B．found; reflected |
| C．found; to reflect | D．found; reflect |
—you play the piano at this time of the day ? I need a good rest for tomorrow’s test.
— Sorry.
| A．Must | B．Shall | C．Can | D．May |
— Have you watched the film “Avatar”?
— Not yet. But I the film is worth watching.
| A．am told | B．was told | C．have told | D．have been told |