______ by a greater demand of vegetables, farmers have built more green houses.
They are______ interesting novels _______ I want to read them once again.
—How long have you been learning English?—About four months.—________! Your English is so good.
Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
It was only after he had read the papers _____Mr. Gross realized the task before him was extremely difficult to complete.
When I arrived, Bryan took me to see the house,_____ I would be staying.