by a greater demand for green products, the food company has set higher standards to ensure the quality.
| A．Driven | B．Being driven | C．To drive | D．Having driven |
It is in Qingdao ___ you’re going to pay a visit to ____ this kind of washing machine is produced.
| A．/; that | B．where; which | C．/; where | D．that; which |
Luckily, the poor boy had enough money _____ he could buy a train ticket.
| A．by which | B．on which | C．with which | D．for which |
________, it began to rain unexpectedly.
| A．While cleaning the machine |
| B．To clean the machine |
| C．He was cleaning the machine |
| D．While he was cleaning the machine |
Several rounds of air and ground attacks from the allied force left the whole city _______.
| A．in pieces | B．in ruins | C．in part | D．in place |
It is the third time that he ____ abroad on business this year.
| A．goes | B．went | C．has gone | D．go |