Some companies are thinking of ways to save natural _____ by making better use of the water used in the bathroom.
| A．resources | B．sources | C．power | D．energy |
—I’m thinking of the test tomorrow. I’m afraid I can’t pass this time.
—! I’m sure you’ll make it!
| A．Go ahead | B．Good luck |
| C．No problem | D．Cheer up |
It was only after he had read the papers Mr. Gross realized the task before him was difficult to complete.
| A．when | B．that | C．which | D．what |
—Did you enjoy yourself last night?
—Yes, it’s very nice of you. I appreciated to your birthday party.
| A．to be invited | B．to have invited |
| C．having invited | D．being invited |
Believe it or not, Lucy’s sister suddenly tears when we were eating.
| A．burst out | B．burst in |
| C．burst into | D．burst on |
basic fist-aid techniques will help you respond quickly to emergencies.
| A．Known | B．Having known |
| C．Knowing | D．Being known |