------- How can we __________ to a changeable environment?-------- By constant study and changing our ideas.
_____ the dull story, he left the hall without ____ anyone .
No one was permitted ______ the empty house without his permission.
---- What did your parents think about your decision? ----They always let me doI think I should.
The weather turned out to be fine yesterday. Ithe trouble to carry my umbrella with me. A should have taken B could have taken C needn’t have taken D mustn’t have taken
----David hasn’t come yet. ----I think he will soon, for he means what he says.