______is very important for us to learn English well.

Do you know the man wearing a pair of glasses?——-Yes.He’s a teacher of _________.He teaches _________history.

Sam, do you know when Alice ______to my party ? —I think she will come when she ______free .

You ______ be hungry already — you had lunch only two hours ago!

DoyouknowwhenLee _______ fordinnerthisevening? —No,butIwillcallyouwhenhe _______. [ ]