Betty will ring me up when she ________ in Beijing.
| A．arrive | B．arrives | C．arrived | D．will arrive |
We don’t know ________ it next. Let’s go and ask Mr. Li.
| A．what to do | B．to do what | C．whether to do | D．to do whether |
I’m glad to find that many trees ________ in our city last year.
| A．plant | B．planted | C．were planted | D．are planted |
The more you smile, the ________ you will feel.
| A．happy | B．happier | C．happily | D．more happily |
–Mr. Wang, can I finish my homework tomorrow? --Sorry, you ________.
| A．can’t | B．don’t | C．needn’t | D．won’t |