It is often the case _____ anything is possible for those who hang on to hope.
查看答案
This is ____ my father has taught me---to face difficulties and hope for the best.
I am writing to ask_____ you are able to do me a favor or not.
I doubt____ he will write back soon.
He showed us ____ he worked out that problem.
微信支付 
支付宝支付