单项选择题The designer has applied for a __________ for his new invention.
单项选择题A good education is an __________ you can fall back on for the rest of your life.
单项选择题Giving a gift can convey a wealth of meaning about your appreciation of their __________ and the importance you place upon the relationship.
单项选择题We couldn't really afford to buy a house so we got it on hire purchase and paid monthly __________.
单项选择题As the mountains were covered with a __________ of cloud, we couldn't see their tops.