. Knowledge of English is a must in international trade.
—Have you been to Mexico?—No, I ______ last year, but Dad wouldn’t let me.
Hawking became world-famous in _______.
They asked me to have a dinner in an excellent restaurant with the, I said that it was at least five years since I _______ a good meal.
He is ______as a leader but he hasn’t__________ in teaching.
The mistakes made by Chinese students are quite different from _________ made by the Japanese students in English study.