The possibility __________ pleasant smells might reduce pain has recently been suggested by new research.
| A．where | B．what | C．which | D．that |
The number of people in the world ______ about 6 billion and large quantities of waste ________ each year.
| A．total; has been produced | B．totals; is produced |
| C．totals; are produced | D．total; are being produced |
You should have told me there was no meeting today, I ___ have run all the way here through the heavy rain.
| A．can’t | B．mustn’t | C．shouldn’t | D．needn’t |
Always read the ________ on the bottle carefully and take the right amount of medicine.
| A．instructions | B．explanations | C．descriptions | D．introductions |
– What do you think of teaching, Bob?
-- I find it fun and challenging. It is a job ________ you are doing something serious but interesting.
| A．that | B．which | C．when | D．where |
America is an ________ country.
| A．English-spoken | B．spoken-English | C．English-speaking | D．speaking-English |