Daniel and I in Class 1, Grade 7. are classmates.

So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard.

Just now,when I walked past your house, I saw your son .

Where are the Greens, may I ask? —Well, they _____ to England. They will come back in a week.

The Qing Dynasty (AD1616-1911) had ten emperors altogether, nine _____ are buried in the two groups of tombs in Hebei Province.