（）标志是警告驾驶人员注意危险地点并将车速降低到规定速度的标志。A、禁令 B、警告

We think it’s probably a good idea for parents to allow teenagers ____in groups during the evenings. I know we get ____sometimes, but we learn a lot from each other. We also think that vacations should be ____.At present they’re too short. Longer vacations would give us time to do things like volunteering. ___summer I had an opportunity ___at the local hospital, but I couldn’t because I had to go back to school.

小题1:	A．to watch B．to study C．study D．play

小题2:	A．noisy B．quiet C．crowded D．lonely

小题3:	A．short B．quicker C．longer D．slower.

小题4:	A．Last B．Next C．Before D．In

小题5:	A．volunteering B．to volunteer C．volunteering D．volunteered