【题目1】If you are a traveler without a guide leading the way, you need to _________ a guide book for details of your journey.
【题目2】The Australian boy has a good ________ of Chinese and can communicate with others freely.
【题目3】As neither of the two countries would ________, no agreement has been reached till now.
【题目4】Our teacher told us that there ________ no end to learning.
【题目5】We should not ________ small mistakes, or they might lead to big accidents.