I am sorry that I can not meet you at the railway station. I _______ Beijing by the time you come back from abroad.
| A．have left | B．will have left |
| C．will leave | D． am leaving |
My father and his teacher talked for about an hour of things and persons ______ they remembered at the school.
| A．that | B．which | C．who | D．what |
They have to explain ______ us the reason _____ their doing so.
| A．/; of | B．with; about | C．/; for | D．to; for |
Hand in hand with reading, Dave ____ the habit of making notes.
| A．caused | B．brought | C．created | D．developed |
In the past few years, Chinese scientists ________ great success in the field of space flight.
| A．achieved | B．have achieved | C．won | D．had won |
History is _______ a subject which only lets us know something in history..
| A．not more than | B．less than | C．more than | D．no more than |