You never know how much difficulty we had ___the problem．Luckily, we managed to solve it with his help.
| A．working out | B．work out |
| C．worked out | D．to work out |
Mr. Wang is leaving ________ Beijing next month.
| A．to | B．with | C．in | D．for |
He is very serious. No one can make him___.
| A．laugh | B．laughs | C．to laugh | D．laughing |
My best friend is good___ swimming, but I do well ________running.
| A．at; in | B．in ; at | C．at; at | D．in; in |
Do you enjoy_____?
| A．to read | B．read | C．reads | D．reading |
My hair is longer than____.
| A．she | B．her | C．hers | D．she’s |