I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.
. The following are some popular websites _________people can sell goods to each other.
—James didn’t turn up last night, did he? —No. He _________.we had changed our plan.
The fact _________she hasn’t know the result of the examination is a great surprise to me.
. A much better way must be found to achieve an equal _________of the resources.
. —On the contrary, I think it is the mother, rather than her children, _________to blame. —I agree with you.