Rather than_______on a crowded bus,he always prefers______a bicycle.
| A．ride; ride | B．riding; ride | C．ride;to ride | D．to ride; riding |
It was never clear _______ the man hadn’t reported the accident sooner.
| A．that | B．how | C．when | D．why |
Barbara Jones offers to her fans is honesty and hapiness.
| A．Which | B．What | C．That | D．Whom |
It is uncertain____side effect the medicine will bring about，although about two thousand patients have taken it.
| A．that | B．what | C．how | D．whether |
The other day，my friend John drove his car down the street at _______I thought was a dangerous speed andsurprised everyone in the car.
| A．which，that | B．which，it | C．as，which | D．what，that |
The lack of eco-friendly habits among the public is thought to be a major ____ of global climate change.
| A．result | B．cause | C．warning | D．reflection |