____ has helped to save the drowning girl is worth praising.
__________ that these creatures are linked to a common ancestor.
These viruses, if ________ in, can result in illness or even death.
Please take down my telephone number ________ something important happens.
Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.
It is generally considered unwise to give children ________ they wants.