–Shall I give you a ride as you look so tired? --_______.
It is said that the gravity on Mars is only about __________ of the gravity on earth.
---I met Daniel in the street yesterday, I ________ him since he left for Beijing. --- Well, does he look like what he used to be?
The old man keeps coughing________.I’m afraid you have to send him to hospital.
In the nineteenth century, English became international language.
Which is the circuit diagram(电路图)of the picture on the right?