15. _______ all the inventions have in common is _____they have succeeded.
A. What; what B. That; that C. What; that D That; what
The Science Museum, ______ we visited during a recent trip to Britain, is one of London’s tourist attractions.
| A．which | B．what | C．that | D．where |
Peter was so excited ______ he received an invitation from his friend to attend the wedding.
| A．where | B．that | C．why | D．when |
When you read a book, you should make a mark ______ you have any question.
| A．where | B．which | C．that | D．what |
Reading is an experience quite different from watching TV; there are pictures ______ in your mind instead of before your eyes.
| A．to form | B．form | C．having formed | D．forming |
The picture ______ on the wall is painted by my grandfather.
| A．having | B．hanging | C．hangs | D．being hung |