The number of people invited _____fifty, but a number of them ______ absent (缺席) for different reasons.
It’s not easy ___ me to talk with the foreigners in English.
The movie was ___wonderful ___I wanted to see it again.
If you can’t work out the math problem, you can ask your teacher ___some____.
The work is ___difficult for the boy to do. Please give him some help.
—How do you study English? —I study by ___ more.