Is he the only one of the students who ________ here just now?
| A．is | B．are | C．was | D．were |
Though plastic bags really bring convenience to us，they also ________ many problems for the environment.
| A．lead to |
| B．refer to |
| C．contribute to |
| D．appeal to |
He was observed ________ into the house before the owner came back.
| A．to slip |
| B．slip |
| C．slipping |
| D．slipped |
—The strong wind has a bad ________ our newly planted young trees.
—What’s more，it ________ many people riding bikes on the road.
| A．effect on；affects |
| B．affect on；effects |
| C．effect in；affects |
| D．affect in；effects |
With the world changing fast, we have something new ________ with all by ourselves every day.
| A．deal |
| B．dealt |
| C．to deal |
| D．dealing |
Public attention at the moment is focused ________ the problem of environment balance.
| A．into |
| B．towards |
| C．about |
| D．on |