-Do you know_______ second-hand smoke?
-To protect our health and memory.
| A．how we should prevent | B．why should we prevent |
| C．why we should prevent | D．how should we prevent |
No decision _________ about that matter yet. We are still considering it.
| A．has been made | B．has made | C．will be made | D．will make |
Though the old man didn’t have enough money, ________ he gave a thousand yuan to the charity.
| A．\ | B．and | C．but | D．or |
I wanted to know _________ last weekend.
| A．what Mary does | B．what does Mary do |
| C．what Mary did | D．what did Mary do |
----- What about going to the South Lake for a picnic next weekend?
----- OK. But I’m not sure ________ it will rain.
| A．why | B．where | C．when | D．whether |
----- How about climbing the hill?
----- I would rather ________ along the river than ________ the hill. I’m a bit tired.
| A．walk; climb | B．walking; climbing | C．walking; to climb | D．walk; to climb |