—Thank you so much for helping me with my English .
— .
| A．With pleasure | B．A pleasure |
| C．I’m glad to hear that | D．No thanks |
These viruses, if ________ in, can result in illness or even death.
| A．breathing | B．breathed | C．breathe | D．to breathe |
Please take down my telephone number ________ something important happens.
| A．in case | B．now that | C．even though | D．as if |
Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.
| A．may; while | B．can; as | C．must; though | D．should; for |
It is generally considered unwise to give children ________ they wants.
| A．however | B．no matter how | C．whatever | D．no matter what |
Without facts, we cannot form a worthwhile opinion for we need to have a factual knowledge ________ our thinking.
| A．which to base on | B．which to be based on |
| C．on which to be based | D．on which to base |