If they don't have any information aboiut the position,(try

If they don't have any information aboiut the position,(try ) ____ to look for e-mail addresses or phone numbers on the web site.
Who have had some experiences in looking for a job,____ (ask) for their advice.
第一个空为什么会填try 而第二个空填 asking呢?为什么同样是动词而形式不一样呢?我实在是想不懂呀?
明白了。在这里一个句子中只能有一个动词啊？如果出现第二个就得变成ING形式啊？哪怕是一个句子中有一个逗号啊？