You should try your best ____ your English.
| A．to improve | B．improving | C．improves | D．improve |
I had __________ unusual experience last week.
| A．a | B．an | C．the | D．/ |
Maybe you should __________.
| A．call on her | B．call him at | C．call him up | D．call up her |
Our physics teacher told us light __________ faster than sound last term.
| A．travels | B．travel | C．travelled | D．travelling |
Xiao Li was supposed __________ her homework before nine o’clock. But she couldn’t.
| A．to finish | B．to finishing | C．finish | D．finishing |
Where was Daly __________ Linda was looking for him?
| A．that | B．while | C．at | D．where |