. —Who____ it be that is knocking at the door?
—It ____ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
In aerospace devices the weight of the necessary power producing equipment is _____.
| A．vital | B．possible | C．capable | D．reliable |
There was a good _____ of the countryside from the front of the bus.
| A．sight | B．view | C．scene | D．scenery |
And you find that you're not to be _____ with a position of real responsibility.
| A．offered | B．trusted | C．furnished | D．retained |
They decided to leave the waiter a big _____ because the food and service had been excellent.
| A．note | B．reward | C．tip | D．gift |
The patients believe that the doctor knows exactly how to put them _____.
| A．correct | B．perfect | C．right | D．well |