Mike came here ________ to see you, _____ after he heard that you had returned from abroad.

Make sure the gas is turned off after a bath, which would ________ cause danger.

---What can I do for you？---Well，I’m afraid the box is heavy for you，but thank you all the same．

Twenty million years ago, Idoho was not the dry place as it is now. ______, it was warm and damp, covered with thick forests.

 — It’s getting dark, but Mr. Chen is till at his office. — No surprise. Who else can _______ he does.