---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．whether we should prevent |
More than two schoolsin the city next year.
| A．are built | B．were built |
| C．have built | D．will be built |
一you your dictionary?
—No. So I have to buy a new one today.
| A．Did; find | B．Have; found |
| C．Are; finding | D．Had; found |
It’s raining heavily. We have tothe picnic.
| A．put off | B．join in | C．hold on | D．take part in |
---There is a book ________ on the ground.
---Let’s ________ and ask who lost it.
| A．lies, pick it our | B．lying, pick it up | C．to lie, pick up | D．lying,pick out it |
It takes more time to go there by train than by bus. It’s by plane of the three.
| A．faster | B．the fastest | C．fast | D．much fast |