6.If we ______ take environmental problems seriously, the earth _______ worse and worse.

　　A.don’t; will be B.won’t; isn’t

　　C.won’t; is D.don’t; won’t be

　　7.My husband always ______ me flowers every week before we got married, but now he never ________.

　　A.sends; does B.sent; does

　　C.was going to send; do D.sent; do

　　8.I hear they are going to London, but I don’t know ________ they will stay there.

　　A.how soon B.how often

　　C.how long D.how fast

　　9.People ______ overweight need more water than thin people.

　　A.who is B.which are

　　C.that is D.who are

　　10.The box was _____ than I had expected.I was out of breath when I got home.

　　A.more heavier B.much heavier

　　C.little heavier D.very heavier