The teacher showed us ______________ the problem.
| A．how to deal | B．what to do |
| C．how to deal with | D．what to deal with |
-- It’s dangerous to walk across the street carelessly.
--You’re right. We can’t be ________ careful while crossing the street.
| A．so | B．very | C．too | D．more |
If we don’t study hard, we will in our class.
| A．take the lead | B．fall behind |
| C．be the first | D．be successful |
I don’t know if she ____________ if it _____________ tomorrow.
| A．comes, snows | B．will come, will snow |
| C．comes, will snow | D．will come, snows |
How much difficulty did you have ________________ this problem?
| A．to solve | B．solved | C．solving | D．solve |