Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．when |
She likes to have everything in order so that she can ______ them when necessary.
| A．have a hand in | B．place hands on | C．put her hands on | D．lay her hand on |
Only when you ______ what you have learned to practice ______ say you have made it.
| A．stick; can you | B．apply; can you | C．use; you can | D．appeal; can you |
After the meeting, she invited us to dinner at her home and treated us ______ delicious food.
| A．with | B．for | C．of | D．to |
Knowing how to give first aid really ______ in case of emergency. It can save lives.
| A．makes difference | B．has a difference | C．makes a difference | D．makes the difference |
Yesterday evening I came across the man who you think is pleased to _____.
| A．be talked with | B．talk | C．work with | D．be worked with |