We were pleased to hear from your letter of 6 August that you were impressed with our selection of toys.
我们很高兴收到你方8月6日来函得知你方对我们的玩具非常感兴趣。
On the other hand, I felt sad that I wasn't able to tell my grandparents that we were safe.
另一方面,我为不能告诉我的祖父母我们十分安全而感到难过。