The last decade of the 21st century ________ the rapid, steady development of China in various fields.
We had hoped that you would be able to visit us, but you _____.
We had hoped to catch the 10:20 train, but _____ it was gone.
— Oh, I ______ where he lives. — Don’t you carry your address book? No, I ______ to bring it.
“I _____ his telephone number.” “I have his number, but I ____ to bring my phone book.”
— Did you happen to see _______ black and _______ white cat? — Are they missing? I told you to take care of them.