听短文，回答问题，听两遍．
16．When did the family go out for the holiday？
A．Last May Day．
B．Last Sunday．
C．Last week．
17．Did it rain on that day？
A．Yes．
B．No．
C．Not sure．
18．How long did it take them to get out of the town？
A．Three hours．
B．One hour．
C．Two hours．
19．What suddenly came to them？
A．A strong wind．
B．A car．
C．A bus．
20．What did they think of their trip？
A．It was pleasant．
B．It was funny．
C．It was sad．