--Has your teacher returned from America yet? --Yes, but he _______ here for only three days before his company sent him to Africa.
— Where did you find your lost pen? —It was in the park _____ we visited that day _____ I found it.
It was __________ back home after the experiment .
She didn’t come to the party last Sunday. __________, she must have made the party more exciting.
— Are you going there with us? — If Mary wants to go, __________.
The teacher told us to remain silent unless _____.