当你和朋友通完电话时,你应该说“__________”。A.Hello! B. How do you do? C. Bye-bye!
At the science museum,the boys and girls get to know__________.
The more you smile, the ___________ you will feel.
We should study the new traffic rules and 1earn how___________ ourselves.
--- Does Ted tell you if he _______________ next Sunday? --- No, he does’t. But if he ________________, I’ll give you a ring.
Tom ______________ sending e-mails _____________ letters.because it is faster.