用所给词的适当形式填空。

1. You are never too old ________ (learn).

2.  I stopped_________(sing) and began to read.

3. Tom ________ (start) playing tennis when he was 7 years old.

4.  Would you like ________ (join) the swimming club?

5.  He learned________ (swim) when he was only 6.

6.  What can I do ________ (become) famous?

小明根据表一中所提供的几种物质的比热容，得出以下四个结论，其中正确的是表一：几种常见物质的比热容

A．液体的比热容比固体大

B．同一物质的比热容可能不相同

C．水和煤油吸收相同的热量，升高的温度相同，煤油的质量是水的2倍

D．内陆地区比沿海地区昼夜温差大，原因之一是干泥土的比热容比水的比热容小