In winter, we must pay attention to _________.
A．keep warm B．keep warmly C．keeping warm D．keeping warmly
He thinks watching movies ________.
A．frustrated B．frustrating C．frustrate D．to frustrate
When we practice speaking English, we often end up _______ in Chinese.
A．to speak B．speak C．spoken D．speaking
There is ______ “u” and ______ “s” in the word “bus”.
A．a, a B．a, an C．an, an D．an, a
---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.
A．may; must B．will; can C．can; may D．may; will
_______ the teachers in the school is one hundred, and _______ of them are women teachers.
A．The number of; four-fifths
B．A number of; four-fifth
C．A number of; four-fifths
D．The number of; four-fifth
