You are so dependent that I’m afraid you can’t adjust yourself to________alone for a time.
The reason __________ he explained was __________ he was ill and unable to go to school.
Last week I bought a cellphone,__________ was very reasonable.
Many countries are now setting up national parks __________ animals and plants can be protected.
A bank is the place __________ they lend you an umbrella in fair weather and ask for it back when it begins to rain.
Whatever is left over may be put into the refrigerator,__________ it will keep for two or three weeks.