Darren has a problem ______ his homework. He needs help.

達倫對作業有問題。他需要幫助。

It is not easy to deal ______ the problem, so take your time.

要處理這個問題不容易，所以慢慢來。

Ordering things from the internet ______ quite convenient for me.

從網路訂購東西對我來說很方便。