— Can I borrow your tape-recorder?
—No. The last time you borrowed it, you _______ it for a month.
| A．kept | B．had kept | C．are keeping | D．have kept |
Shortly after we ______, a waiter came over to us with a smile.
| A．sat | B．seated | C．was seated | D．seated ourselves |
The reason _____ he gave for not coming to your birthday party is ______ his mother was ill.
| A．what; which | B．why; that | C．as; which | D．which; that |
Who do you think the teacher will ______ the question?
| A．have answer | B．have answered | C．have to answer | D．has answered |
The man will have to wait all day ______ the doctor works faster.
| A．if | B．unless | C．where | D．that |
With a lot of difficult problems ______, the newly-elected president is having a hard time.
| A．settled | B．settling | C．to settle | D．being settled |