下列各组字母中全部是元音字母的是 ____。
| A．a, e, o, r | B．a, i, u, e |
| C．o, u, e, n | D．b, e, c, t |
My friend ______ a birthday present for me last Sunday.
A. buy B. buys C. bought
He is eating dinner, _____ then the telephone rings.
A. and B. but C. or
We are _____ the supermarket now.
A. at B. under C. on
They ________ for twelve hours a day.
A. eating B. eats C. eat
We say thank you ________ all the good _______ we have.
A. for , thing B. from , things C. for , things