— Where is Lin Tao? — He _____ to the teachers’ office. He will be back soon.
| A．go | B．has gone | C．has been | D．went |
He said he_____ to my home in a week.
| A．would come | B．came | C．comes | D．will come |
Sally has been swimming ______ four hours.
| A．for about | B．since | C．about | D．/ |
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
| A．collected | B．had collected |
| C．has been collecting | D．had been collecting |
I had a really hard time _____studying science this term.
| A．to | B．with | C．in | D．on |
Don’t ______ others when they make mistakes.
| A．laugh at | B．laugh with | C．laugh to | D．laugh |