1. 帖主对此回复很满意，所以奖励 4 积分给沅芷澧兰
How do you manage to judge the English level/standard of the student?
2. 帖主对此回复很满意，所以奖励 7 积分给沅芷澧兰
Who can translate the sentence into English for me? And this is my translation
3. 帖主对此回复很满意，所以奖励 5 积分给沅芷澧兰
For a single man, the sky is very blue, too blue to be gloomy; Living alone makes you free, too free to be lonely
4. 帖主对此回复很满意，所以奖励 10 积分给沅芷澧兰
A gray toad is hopping around on the mildewed muddy plot.