The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
| A．for,on | B．on,for | C．for,for | D．on.on |
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 |
I’m ____your class today so you must do ____ I tell you.
| A．in charge of; as | B．instead of; what | C．in the form of; like | D．looking at; as |