It was _____ computer games that cost the boy a lot of time that he ought to have spent on his lessons.
| A．to have played | B．playing | C．played | D．having played |
Each time ________ they met, they would talk long hours together.
| A．which | B．when | C．during | D．/ |
Though ______ _money, his parents managed to send him to a key university.
| A．lacked | B．lacking of | C．lacking | D．lacked in |
In time of serious accidents, ________ we know some basic things about first aid, we can save lives.
| A．whether | B．until | C．if | D．unless |
The parents suggested ________ in the hotel room but their kids were anxious to camp out during the trip.
| A．sleep | B．to sleep | C．sleeping | D．having slept |
________ by the beautiful scenery of the West Lake, the foreigners decided to spend another two days in Hangzhou.
| A．Attracting | B．Attracted | C．To be attracted | D．Having attracted |