He is one of the students who, I am sure, always do ____ best.

Who told you to clean the windows ?—Father ___.He said they were too dirty (脏的)

Why are you late, Jim?—Because there _________ a lot of traffic when I came here.

The guide’s last words_________us that we should bring raincoats or umbrellas.

Did you take part in the sports meeting last week?—Of course I didn’t, don’t you know that it was ______ because of the rain.