When workers are organized in trade unions, employers find it hard to lay them ________.
D
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Itisusefultoscience_______theearthasanobjectinspace.
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
Theboyranoutoftheclassroomwithouttheteacher's_______.
________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.