15．You may ________ the textbook if you don’t know the answer to the question.
| A．refer to | B．deal with | C．look up | D．look into |
Eric had received training in computer for one year _______ he found a job in a big company.
| A．before | B．after | C．since | D．as |
His teacher insisted that he ______ his hair ______ the next day.
| A．had, to cut | B．have, cut | C．would have, to be cut | D．should have, to cut |
How are the kids spending their childhood? I can’t help recalling（回忆）that there was a time _______ we played happily and freely in the outside.
| A．that | B．which | C．when | D．不填 |
John asked Tom ______ give him a lift to the office.
| A．if he could | B．could you | C．if could he | D．if could |
She wrote ______ second book, which turned out to be still popular with ______ young.
| A．the; the | B．a; 不填 | C．a; the | D．the; 不填 |