It’s suggested that everyone should_______ at least one hour a day to keep fit.
---John, have you gone over your lessons learnt this morning? ---Not yet. ---You should know _____.
Howard Carter is one of the best-known explorers the world _____.
_____the teacher couldn’t understand was _____ fewer and fewer students showed interest in his class.
-- You look so tired. --- Yes. I _____ the house all the morning. But I’m finishing it soon.
Police in America have stepped up their search for a fifteen-year-old boy who went _____ three days ago.