Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on;at |
With the price of pork and eggs _______ quickly, CPI has become a hot phrase among Chinese.
| A．raising | B．going up | C．to raise | D．to go up |
To improve the quality of our products, we asked for suggestions _______ had used the product.
| A．no matter who | B．who | C．whoever | D．whichever |
With more forests being destroyed in that area, huge quantities of land _______ deserts each year.
| A．has been turned into | B．had been turned into |
| C．is being turned into | D．are being turned into |
—Excuse me sir, where is the room 301?
—Just a minute. I’ll get Bob _______ you to your room.
| A．show | B．shown | C．to show | D．showing |
However, at times this balance in nature is disturbed, _______ a number of possibly unforeseen effects.
| A．resulting from | B．resulting in |
| C．having resulted from | D．having resulted in |