— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
— Oh, dear ! She ______ a lot of difficulties !
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |
In addition to his traditional medical treatment, he tried to put himself in situations______ would bring about positive emotions.
| A．which |
| B．where |
| C．why |
| D．as |
Eating properly and exercising _______ make one enjoy a longer and healthier life.
| A．normally |
| B．generally |
| C．regularly |
| D．directly |
— _______ you got to know my telephone number?
— Through a friend of yours.
| A．How was it |
| B．How was it that |
| C．Was it how that |
| D．How did |
It is almost five years_________we saw each other last time.
| A．before |
| B．since |
| C．after |
| D．when |
—Do I need to give a tip if I eat at a fast food restaurant in the United States?
—Yes, it’s a common ______ to tip waiter in a restaurant.
| A．sense |
| B．custom |
| C．method |
| D．practice |