It is the greatest happiness on earth ______.
| A．loving and to be loved | B．to love and being loved |
| C．to love and to be loved | D．love and be loved |
—Won't you go shopping with your mother?
—No.________ she promises to buy me a new sweater.
| A．Now that | B．If only | C．As though | D．Unless |
The result is very important.It is supposed ______ a secret between you and me.
| A．to be kept | B．to keep | C．being kept | D．keeping |
Knowledge and learning are important if we want to be successful, but they may also ________our thinking.
| A．direct | B．limit | C．change | D．improve |
The harder you ________， the better progress you ________.
| A．will work; will make | B．work; have made |
| C．work; will make | D．will work; make |
Professor Smith is now ________ the company, which was once________ Professor White.
| A．in charge of; in charge of | B．in charge of; in the charge of |
| C．in the charge of; in the charge of | D．in the charge of; in charge of |