He broke his legs while ＿＿＿＿＿.
| A．riding | B．ride | C．was riding | D．rode |
All ______ we need is to be supplied with food and clothing.
| A．what | B．that | C．which | D．whom |
Play, often seen as _______ activity for kids ,is still important in _____ development of teenagers.
| A．the ; the | B．an; the | C．an ;不填 | D．the；不填 |
The oil price has _______ a lot these days because of the war .
| A．gone back | B．gone up | C．gone over | D．gone out |
The foreign friends you referred to _______ looking forward to _______around our university.
| A．are ; being shown | B．being ;being shown | C．being ; showing | D．are ;be shown |
We were having a meeting _________ suddenly someone knocked at the door.
| A．because | B．when | C．as | D．while |