Who can help me carry the heavy box—I think David is _______ to do it. But the door is ______for him to go through.

She suggested the number of cars should be limited to stop air pollution. —_______, the idea is not very practical.

“Shall we go fishing this weekend” “_______. I’ll go with you.”

Are you going to climb the mountain tomorrow–Yes. But if it ______, I_______ at home.

s point out ____ we eathealthy food every day, we still need to do much exercise regularly to keepfit.