They key _____ success is hard work and persistence.
They key \_\_\_\__ success is hard work and persistence.
因此
We are all very grateful _____ you for your help.
We are all very grateful \_\_\_\__ you for your help.
If Jack _____ to the office tomorrow, give him the letter please.
If Jack \_\_\_\__ to the office tomorrow, give him the letter please.
_____ Yellow River is known to be _____ second longest river in China.
\_\_\_\__ Yellow River is known to be \_\_\_\__ second longest river in China.
Neither Jane nor Ted _____ going to meet Professor Jones next Friday because both of them will be busy with their classes then.
Neither Jane nor Ted \_\_\_\__ going to meet Professor Jones next Friday because both of them will be busy with their classes then.
By the year 2020, China’s population probably _____ 1.4 billion.
By the year 2020, China’s population probably \_\_\_\__ 1.4 billion.
Mary is the only student in my class _____ speaks Chinese.
Mary is the only student in my class \_\_\_\__ speaks Chinese.
Anna complained the hotel was too expensive. It had _____ her 1,000 dollars for the night.
Anna complained the hotel was too expensive. It had \_\_\_\__ her 1,000 dollars for the night.
_____ was in a completely different way that he played the game.
\_\_\_\__ was in a completely different way that he played the game.
The weather forecast says there’s going to be a heavy storm here in two or three hours, so we have to hurry back home _____ it comes.
The weather forecast says there’s going to be a heavy storm here in two or three hours, so we have to hurry back home \_\_\_\__ it comes.