─Do you know_____second-hand smoke? ─To protect our health and memory.
| A．how we should prevent | B．how we should prevent |
| C．why we should prevent | D．whether we should prevent |
I the camera for a week already.
| A．bought | B．have bought | C．borrow | D．have kept |
You have never visited the place before, you?
| A．did | B．didn’t | C．have | D．haven’t |
–Where are the children? – They to Beijing.
| A．have been | B．have gone |
| C．have left | D．have arrived |
–Who ate my ice-cream?
–It by Eddie.
| A．is eaten | B．was eaten |
| C．was eaten | D．has been eaten |
Could you give me advice?
| A．some | B．any | C．many | D．a lot |