He took his umbrella with him lest it ____(rain).
should rain
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InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.
Thepresentcrisisbearssome________(similar)totheoilerisisofthe1970s
A task of the post office staff is to_ (class) mail according to the places it is to go
Notuntilrecently_____thatThompsonhadbentellingthetruthallalong
Experts have found that normal sleep can be divided into five______stages